| 单词 | ohm |
| 例句 | They had discovered the X ray, the cathode ray, the electron, and radioactivity, invented the ohm, the watt, the Kelvin, the joule, the amp, and the little erg. A Short History of Nearly Everything 2003-05-06T00:00:00Z “Can you play ‘ohm’ with an instrument and get into that mood of deep listening?” Meet the encephalophone: An instrument you can play with your mind, just by thinking 2017-03-23T04:00:00Z Sometimes I just let the water pummel the top of my head and listen to the ohm of the fan’s whir, losing myself in the hug of its hum. Perspective | You call it a root canal. I call it a bittersweet symphony. 2021-10-27T04:00:00Z Unfortunately, when you buy a resistor, you can’t get one that is exactly 1000 ohms; rather, it is guaranteed to be only within 10 percent of that value. From “phreaks” to Apple: Steve Jobs and Steve Wozniak’s “eureka!” moment 2013-02-16T14:00:00Z “It’s a little bit like doing ‘ohm,’ ” he said. Meet the encephalophone: An instrument you can play with your mind, just by thinking 2017-03-23T04:00:00Z He finds that the resistance between two points on the same finger is about the same as the resistance between two points on opposite hands—both are several hundred thousand ohms. College Physics for AP Courses 2015-08-12T00:00:00Z When the current in a circuit is 40 amperes, the resistance is 10 ohms. Algebra and Trigonometry 2015-02-13T00:00:00Z After breaking into Belfort’s account, the hacker transferred large quantities of ohm, a popular cryptocurrency token, to a separate wallet — a publicly visible transaction that Belfort could do nothing to reverse. The Wolf of Crypto: Famous fraudster Jordan Belfort now boosting bitcoin 2022-04-15T04:00:00Z Last July 4, regulars joined each other online to “ohm from home.” New Mexico forest draws crowd for annual ‘Rainbow Gathering’ 2021-07-03T04:00:00Z Because of this, the quantum Hall effect is used to confirm the accuracy of the ohm, the unit of electrical resistance. The quantum Hall effect continues to reveal its secrets to mathematicians and physicists 2020-07-28T04:00:00Z Inductive reactance XL has units of ohms and is greatest at high frequencies. College Physics for AP Courses 2015-08-12T00:00:00Z The absolute value of the difference between the actual and nominal resistance should not exceed the stated variability, so, with the resistance in ohms, Algebra and Trigonometry 2015-02-13T00:00:00Z Topological insulators are so insensitive to disorder that they were previously used to define the unit of resistance: the ohm. Quantum cascade laser lives on the edge 2020-02-11T05:00:00Z She also named the brand’s restorative lavender body oil Aum, after the yoga chant more commonly spelled “ohm.” The purple iPhone is just the tip of the lavender craze | Produced by Advertising Publications 2019-09-20T04:00:00Z The effect is so robust that it was taken as the basis for defining the ohm — the unit of measurement of resistance — in the reformed SI that went into effect in May. Strange topological materials are popping up everywhere physicists look 2019-07-02T04:00:00Z Interestingly, their individual resistances in ohms do not simply add. College Physics for AP Courses 2015-08-12T00:00:00Z The current in a circuit varies inversely with its resistance measured in ohms. Algebra and Trigonometry 2015-02-13T00:00:00Z More than twice as powerful as the Connect:Amp The Amp is more than twice as powerful as the Connect:Amp, delivering 125 watts per channel into an 8 ohm load with both channels driven. The new Sonos Amp is coming to save your old speakers 2018-08-29T04:00:00Z The first time he walked into the fitting he wore all pink; pink maharishi pants, pink drop Orbit yogi pants, pink T-shirt with an ohm symbol, a beanie and Toms shoes. '20th Century Women's' 1979 costumes had to straddle two distinct eras 2017-01-05T05:00:00Z Then again, he may need a different chant since "ohm" no doubt sounds like something, ahem, pleasant. Deal Made on Filner's Future, But No One's Telling 2013-08-22T15:05:21Z The units of impedance are ohms, and its effect on the circuit is as you might expect: the greater the impedance, the smaller the current. College Physics for AP Courses 2015-08-12T00:00:00Z Find the current if the resistance is 12 ohms. Algebra and Trigonometry 2015-02-13T00:00:00Z The terms gas, ohm, Ampère, volt, etc., are in international use, but they are not Latin nor Greek. Popular scientific lectures 2012-04-24T02:00:17.273Z She found herself fielding questions like “ ‘Is ‘ohm’ God? In Queens, Seeking to Clear a Path Between Yoga and Islam 2012-04-08T21:34:35Z To give a rough approximation I would state that, with an ordinary coil of, say 10,000 ohms resistance, the most powerful arc would be produced with about 12,000 alternations per second. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Or if we like to use the initials of volts, ampères, and ohms, instead of the general terms, E, R, and C, we may write V/R = A, or Volts/Ohms = Ampères. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z Megohm, meg′ōm, n. a unit of electrical resistance, equal to one million ohms. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) 2012-01-11T03:00:23.770Z The primary circuit, if formed of 360 turns of No. 12 H.C. copper wire, would have a resistance of 0�36 of an ohm, and an inductance of 0�02 of a henry. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The resistance with which the current meets in flowing along a conductor is measured in ohms. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z A rough idea of it is given by the fact that a copper wire a sixteenth of an inch thick and 400 feet long has a resistance of about one ohm. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z From this it appears that 1 volt will send a current of 1 ampère through a total resistance of 1 ohm, since 1 divided by 1 equals 1. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z At night the gas lamps light our street, Electric bulbs our homes; The gas is billed in cubic feet, Electric light in ohms. Chimneysmoke 2011-10-27T02:00:25.953Z Supposing we are charging a condenser having a capacity of one-hundreth of a microfarad, through a resistance of ten thousand ohms. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z EXAMPLE—A current of 42 amperes flows through three conductors in parallel of 5, 10 and 20 ohms resistance respectively. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Then the electrician speaks lightly of numbers of "amperes," he may even talk of the number of "watts" used by the lamps, while occasionally the word "ohm" will leak out. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z So also 1 volt can send a current of 4 ampères through a resistance of ¼ of an ohm, since 1 divided by ¼ is equal to 4. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z In order to stabilize the arc, a series resistance of a few ohms is necessary. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Since ten thousand ohms is equal to one-hundredth of a megohm, the time-constant would be equal to one-ten-thousandth of a second, and ten times this time-constant would be equal to a thousandth of a second. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z An ampere is the current produced by an E. M. F. of one volt in a circuit having a resistance of one ohm. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z The three units—the volt, ampere and ohm—are so related that a pressure of one volt acting upon a circuit with a resistance of one ohm will produce a current of one ampere. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z The electro-motive force of a single Leclanchè cell is, as we have seen at § 38, about 1·6 volt, and the internal resistance of the quart size, about 1·1 ohm. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z The coil is wound for a resistance of about 200 ohms, and the diaphragm should be fairly thin but very resillient. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 It is therefore obvious that under these exact conditions the resistance or back E.M.F. of the arc, as it is termed, must equal 4.5 ohms. Optical Projection Part 1: Projection of Lantern Slides An ohm is equal to the resistance offered to an unvarying electric current by a column of mercury at 32° Fahr., Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Yes, yes," says he, for he understood me not, "if we can get two ohms of the good Westphalian beer every day we shall not fare ill. The Adventurous Simplicissimus being the description of the Life of a Strange vagabond named Melchior Sternfels von Fuchshaim In persons suffering from nervous anxiety, it decreases to five thousand and even down to a thousand ohms in cases of hysteria. The Social Gangster This relay has a resistance of 4,500 ohms and a high impedance, and operates the selector mechanism which is a special modification of the ratchet and pawl principle. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The resistance of such bobbins will probably be from two to three ohms each. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action The electromotive force is about 1.48 volts and the internal resistance about 4 ohms. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z The resistance R was about 9 ohms, and the potential difference E was varied from three to six Clark cells, giving a rate of heat-supply about 2 to 6 watts. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" Normally, this resistance averages from seventy to eighty thousand ohms. The Social Gangster The relay 2 has a very high resistance winding—about 15,000 ohms—and this resistance is so great that the tip supervisory relay of the A-operator's cord will not pull up through it. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Convenient multiples and subdivisions of the ohm are the microhm and the megohm, the former being a millionth part of an ohm, and the latter a million ohms. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" If the resistance of a mile of telegraph wire be 13 ohms, that of fifty miles will be 50 × 13 = 650 ohms.77 2. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z If it has a million ohms we say it has a “megohm” of resistance. Letters of a Radio-Engineer to His Son Its value should be as low as possible, and, in fact, it is almost negligible even I in small batteries, seldom rising above 0.05 ohm. The Automobile Storage Battery Its Care And Repair In the third strand of each cord is placed a 12-volt supervisory lamp, and in series with it a resistance of about 80 ohms. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The resistivity of substances is then numerically expressed by stating the resistance of one cubic centimetre of the substance taken between opposed faces, and expressed in ohms, microhms or megohms, as may be most convenient. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The specific resistance of a metal is generally expressed in millionths of an ohm as the resistance of a centimeter cube of that metal between opposite sides. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z For telephone receivers I would buy a really good pair with a resistance of about 2500 ohms. Letters of a Radio-Engineer to His Son By means of heavy connecting wires, five of these thermometers are connected in series, giving a total resistance of the system of not far from 20 ohms. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man In practice the supervisory relay windings have each a resistance of about 20 ohms and the shunt around them each a resistance of about 31 ohms. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The reciprocal of the ohm is called the mho, which is the unit of conductivity, and is defined as the conductivity of a substance whose resistance is one ohm. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Take, for instance, two branches of 100 ohms resistance each and find the joint resistance80. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Assemble them so as to make a rheostat with a range of 0-1000 ohms by steps of 10 ohms. Letters of a Radio-Engineer to His Son The resistance of the five thermometers is not far from 20 ohms. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man A No. 18 copper wire interposes a resistance of one ohm, for each 156.5 feet length. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The absolute unit of conductivity is the conductivity of a substance whose resistivity is one absolute C.G.S. unit, or one-thousandth-millionth part of an ohm. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" If, for instance, the resistance of an incandescent lamp hot be 180 ohms, the joint resistance of 100 such lamps connected in multiple is 180⁄100 = 1.8 ohms. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z That means that the coil has a resistance of one ohm. Letters of a Radio-Engineer to His Son The sensitiveness is so great that it is desirable to introduce a resistance of some 500 ohms into the thermal-junction circuits. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man With a 220-volt current, the ohms resistance required in series with the storage battery of this size would be 29.33 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine These values have accordingly been accepted as the official and recognized values for the specific resistance of mercury, and the definition of the ohm. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" A volt-coulomb of work is performed when one ampere of current flows for one second in a circuit whose resistance is one ohm, when the pressure is one volt. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z How many ohms would the coil have if it took 5 volts to send 2 amperes through it. Letters of a Radio-Engineer to His Son The resistance of this system is also not far from 20 ohms, thus simplifying the use of the apparatus already installed on the observer's table. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man How many feet of No. 7 copper wire would give a resistance of 2¾ ohms? Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The reciprocal of this, or the conductivity, is a more generally useful constant; it is conveniently expressed in terms of a unit equal to the reciprocal of an ohm. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" They forgot the good example set by the grid, the volt and the ohm and they went and used jawbreakers. Radio Boys Loyalty Bill Brown Listens In If a coil of resistance three ohms is carrying two amperes what is the voltage across the terminals of the coil? Letters of a Radio-Engineer to His Son If the contact is made at T, the current passes through 2,600 ohms, directly across the 110-volt circuit, and consequently there is no effective current flowing through the plunger Pl. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man Referring to the copper wire table, we find that it requires 2006.2 of No. 7 wire to make one ohm. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine At night the gas lamps light our street, Electric bulbs our homes; The gas is billed in cubic feet, Electric light in ohms. Songs for a Little House An ampere is an electromotive force of one volt through a resistance of one ohm. Electricity for Boys For 1 ohm it would take 1 volt to give a current of 1 ampere, wouldn’t it? Letters of a Radio-Engineer to His Son When the contact T is open, the current flows through the plunger in series with 2,600 ohms resistance. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man It would consume 6 × ½ ampere, or 3 amperes of current, and interpose a resistance of 36.6 ohms—say 37 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The resistance of the secondary wire should be from 100 to 150 ohms. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. Calculating the Voltage.—In order to arrive at the voltage we must use a conductor, which, with a resistance of 1 ohm, will produce 1 ampere. Electricity for Boys For 3 ohms it takes three times as much to give one ampere. Letters of a Radio-Engineer to His Son Five thermometers, each having a resistance of not far from 4 ohms, are connected in series and suspended 3.5 centimeters from the wall on hooks inside the chamber. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man For 37 ohms, 5,790 feet would be required, for copper wire, which of course would be impractical. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine You see, they weren't designed to indicate such distances on such small objects as men, so I threw a million ohms in series with the impulse. Skylark Three This resistance is measured in ohms, as explained in a preceding chapter, and it is this resistance which is utilized for electric heating. Electricity for Boys If an e. m. f. of 8 volts is sending current through a resistance of 2 ohms, how much current is flowing? Letters of a Radio-Engineer to His Son The thought carried him back to the electrical laboratory of the Institute, and he began to dream that he was still a student of ohms, volts, and amperes. Under the Great Bear Apply Ohm's Law, as before, and we have R equals E divided by C, or R equals 110 divided by 7, which is 15.7 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine In a tin wire cell, with interposed external resistance equal to one million ohms, the wire A was subjected to a series of vibrations through 180°, and a deflection of 210 divisions was obtained. Response in the Living and Non-Living The resistance to a current flow in such a column would be equal to 1 ohm. Electricity for Boys The leak should have a very high resistance, usually one or two million ohms if the condenser is about 0.002 microfarad. Letters of a Radio-Engineer to His Son The two are alike charged to the limit; one more ohm, or molecule, and they would burst. Damn! A Book of Calumny The unit of electrical resistance is called the ohm—named after a man, as are all electrical units. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Taking a carrot as the vegetable tissue, I found its resistance plus the resistance of the non- polarisable electrode equal to 20,000 ohms. Response in the Living and Non-Living We must therefore have a standard for the ohm, which is the measure of resistance. Electricity for Boys Suppose the internal resistance of the tube is 12,000 ohms and the resistance of the telephones is 3,000 ohms. Letters of a Radio-Engineer to His Son That might even be interesting, at that; would it be anywhere near 300 ohms here? The Sky Is Falling This is usually done by indicating its capacity in watts, which as we have seen, means volts times amperes, and from this one can figure ohms, by the above formulas. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The introduction of a chemical reagent reduced it to 19,000 ohms. Response in the Living and Non-Living This is formed of three simple electro-magnets, whose bobbins have a resistance of no more than 10 ohms, and which are united in series. Scientific American Supplement, No. 365, December 30, 1882 To do so you tell how many “ohms” of resistance it has. Letters of a Radio-Engineer to His Son The name amp�re will be given to the current produced by the electromotor force of 1 volt in a circuit whose resistance is 1 ohm. Scientific American Supplement, No. 312, December 24, 1881 The resistance of this 10 feet of No. 2 copper wire, is, as we find by consulting a wire table, .001560 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The resistance of the galvanometer is equal to 1,000 ohms. Response in the Living and Non-Living In order to produce the difference of phase, a resistance of 17 ohms was introduced into the second circuit, when the dynamo produced a current of 9 amperes with 80 inversions per second. Scientific American Supplement, No. 717, September 28, 1889 The ohm is the unit in which we measure the resistance of a circuit to an electron stream. Letters of a Radio-Engineer to His Son No matter what their origin, all belong to one family now; gnu is as much English as knew, japan as pogrom, fête as papoose, batik as radii, ohm as marconigram, macadamized as zoomed. Public Speaking This 2,000 feet of wire would introduce a resistance of one ohm in the circuit. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine If you have the right kind of stuff in you, you will make every ohm of your force do something for you. The Young Man and the World The cylinder is covered with asbestos sheet, and the wire, which is of nickel, and measures altogether from 3 to 4 ohms, is wound helically round this. Scientific American Supplement, No. 711, August 17, 1889 I can show you what an ohm is if I tell you a simple way to measure a resistance. Letters of a Radio-Engineer to His Son One of these apparatus, quite crudely mounted, was put into a circuit with a resistance of 300 ohms. Scientific American Supplement, No. 508, September 26, 1885 If, however, the pressure were 110 volts, and the current one ampere, and the resistance one ohm, the effective pressure after transmission would be 110-1, or 109 volts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine There is a second "graduating" electromagnet, E1, of 500 ohms resistance introduced between the sending battery, B, and the key. Scientific American Supplement, No. 443, June 28, 1884 An approximate ohm for rough work in the laboratory may be made by winding 9 feet 5 inches of number 30 copper wire on a spool or arranging it in any other convenient form. General Science It also means one ohm is such a resistance that one volt will send through it a current of one ampere. Letters of a Radio-Engineer to His Son As regards the loss, suppose that the resistance of the overhead lines is one ohm. Scientific American Supplement, No. 620, November 19,1887 To force a 110-volt current of 50 amperes through the resistance of one ohm, would require the expenditure of 50 volts pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine We may estimate it at 1/3 or 1/4 of an ohm for polar surfaces one decimeter square, separated by a distance of five centimeters. Scientific American Supplement, No. 421, January 26, 1884 To find q we must first construct a column of mercury of known dimensions; this problem was solved by the International Bureau of Weights and Measures for the construction of the legal ohm. Scientific American Supplement, No. 613, October 1, 1887 For example, it means also 66that one volt will send a current of one ampere through a resistance of one ohm. Letters of a Radio-Engineer to His Son Among the most important of the apparatus exhibited we must reckon Mr. Cailletet's devices for liquefying gases, and those of Mr. Mascart for determining the ohm. Scientific American Supplement, No. 441, June 14, 1884. One is by increasing the size of the transmission wires, thus cutting down the resistance in ohms; the other way is by raising the voltage, thus cutting down the per cent loss. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A granular-carbon transmitter may vary between resistances of 5 to 50 ohms while transmitting a particular tone, having the lower resistance when its Page 34 diaphragm is driven inward. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The legal ohm is supposed to have a resistance equal to 106.00 times that of a cube of mercury of 0.01 meter, side measurement. Scientific American Supplement, No. 613, October 1, 1887 Notice that I told the number of ohms and the number of volts, what are you going to tell? Letters of a Radio-Engineer to His Son At Portrush the resistance of a mile, including the return by earth and the ground rails, is actually about 0.23 ohm. Scientific American Supplement, No. 388, June 9, 1883 It would take two volts to force two amperes through one ohm; or 100 volts to force 100 amperes through the resistance of one ohm. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Using the same values of resistance in the transmitter and line, assume the local circuit apart from the transmitter to have a fixed resistance of 5 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Laboratory voltameters frequently have a resistance of a hundred ohms; it would require a million in derivation to produce the same effect. Scientific American Supplement No. 819, September 12, 1891 You can assemble a resistance which will do fairly well if you will buy a small rheostat which will give a resistance varying by steps of ten ohms from zero to one hundred ohms. Letters of a Radio-Engineer to His Son If calculated from the section of the iron, it would be 0.15 ohm, the difference being accounted for by the resistance of the copper loops, and occasional imperfect contacts. Scientific American Supplement, No. 388, June 9, 1883 In an ordinary 16 candlepower carbon lamp, the resistance of this filament is 220 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Bridging bells are ordinarily wound to a resistance of 1,000 or 1,600 ohms, these two figures having become standard practice. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The total metallic resistance of the circuit should not be less than 10 ohms. Scientific American Supplement No. 822, October 3, 1891 At the same time you can buy four resistance spools of one hundred ohms each and perhaps one of 500 ohms. Letters of a Radio-Engineer to His Son Suppose the line and electromagnet have together a resistance of 6 ohms, and that we have 24 small Daniell cells, each of electromotive force say 1 volt, and of internal resistance 4 ohms. Scientific American Supplement, No. 787, January 31, 1891 After that we rode a German mile through a wood, where each tree had its vine--many trees carried 3 ohms of wine, which is pleasant to see--and came to Nola.' The Development of the Feeling for Nature in the Middle Ages and Modern Times The clearing-out drop was of 500 ohms resistance and was connected from the answering side of the tip conductor to the calling side of the sleeve conductor. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The generating machine is driven by a locomotive engine; the resistance of its field magnets is 5.68 ohms, and of the two armatures 33 ohms. Scientific American Supplement, No. 520, December 19, 1885 The impedance of its secondary will be a quarter of this or 3,000 ohms. 196If we connect such a transformer in the circuit, as shown, we shall obtain the greatest output from the tube. Letters of a Radio-Engineer to His Son When all the cells are in series, the resistance of the battery will be 96 ohms, the total resistance of the circuit 102 ohms, and the full value of the current 0.235 ampere. Scientific American Supplement, No. 787, January 31, 1891 In each multiplier wire I have 500 ohms resistance. Scientific American Supplement, No. 492, June 6, 1885 The primary current was transformed by an induction coil of the ordinary type and the transformed current was sent through a non-inductive resistance of 3,000 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The resistance of the two armatures of the receiving machine is 36.8 ohms, and the resistance of the line is 97 ohms; the generator and receiver field magnets are excited each by a separate machine. Scientific American Supplement, No. 520, December 19, 1885 In the first place the primary of the transformer has a number of ohms just equal to the internal resistance of the tube. Letters of a Radio-Engineer to His Son Let E = 2 volts; R = 1 ohm; and let us take a relatively large self-induction, so as to exaggerate the effect; say let L = 10 quads. Scientific American Supplement, No. 787, January 31, 1891 A Bradley tangent galvanometer is used, employing the coil of 160 ohms resistance. Scientific American Supplement, No. 492, June 6, 1885 The units are: of current, the ampere; of electromotive force, the volt; of resistance, the ohm. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The Signal Officer was down in the cellar, handing over ohms, ampères, short-circuits, and other mysterious trench-stores to his "opposite number." All in It : K(1) Carries On A Continuation of the First Hundred Thousand In some tubes it may be five or six thousand ohms, and in others several times as high. Letters of a Radio-Engineer to His Son The Paris units were adopted in face of the fact that the length determined upon at Paris was not the length that Professor Rowland himself had found as that which should represent the ohm. Scientific American Supplement, No. 481, March 21, 1885 In the low state, it may be a few ohms, or even a few hundredths of an ohm. Scientific American Supplement, No. 492, June 6, 1885 This is the general practice with series telephones, the ringers ordinarily having short cores and a comparatively small number of turns, the resistance being as a rule about 80 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In 1880, upon the completion of the Rapid Company's 6 ohm wire, between New York and Boston, 1,200 words per minute were transmitted between the cities above named. Scientific American Supplement, No. 446, July 19, 1884 Since it will be different in different cases we shall use a symbol for it and say that it is RP ohms. Letters of a Radio-Engineer to His Son This is equal to the effect produced by a Grove's cell in a circuit of 45,000 ohms resistance. Scientific American Supplement, No. 481, March 21, 1885 The four bobbins are grouped for tension, and have a total resistance of 30,220 ohms. Scientific American Supplement, No. 492, June 6, 1885 The windings of this particular coil are four in number, and contain about 2,400 turns each, and have a resistance of about 60 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. When complete, the wire was rather larger than No. 3, English gauge, but varied in diameter, some being as large as No. 1, and it averaged 525 lb. of copper per mile and = 1.5 ohms. Scientific American Supplement, No. 446, July 19, 1884 These pieces are inclosed in a nickelized copper box provided with a screw cap, C. The resistance of both the receiver and transmitter bobbin is 200 ohms. Scientific American Supplement, No. 531, March 6, 1886 The resistance when making 120 revolutions per minute is 2,810 million ohms. Scientific American Supplement, No. 481, March 21, 1885 In the high state, it is the normal working resistance of the cell, usually between 5,000 and 200,000 ohms, but is often up among the millions. Scientific American Supplement, No. 492, June 6, 1885 The fourth property of telephone lines, insulation of the conductors, usually is expressed in ohms as an insulation resistance. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. I then placed both ends of the wire to earth through 3,000 ohms resistance, and introduced a small auxiliary battery between the chemical paper and earth. Scientific American Supplement, No. 446, July 19, 1884 It is stated that 'the internal resistance of the armature' of this machine 'is only 1/2 ohm.' Edison, His Life and Inventions The experimental work of first making practical standards, founded on the absolute system, which led to the unit now known as the British Association ohm, was chiefly performed by Clerk Maxwell and Jenkin. Memoir of Fleeming Jenkin On again using the current from 25 elements, the resistance instantly returned to 40,000 ohms. Scientific American Supplement, No. 492, June 6, 1885 A million ohms, therefore, is called a megohm. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The high tension voltage of that bright blue current felt like ohm sweet ohm, but Aubrey dared not risk too much of it at once. The Haunted Bookshop A given straight wire having 1 ohm resistance and certain length is brought to a given degree of temperature by given battery. Edison, His Life and Inventions There remains now only to determine the resistance in ohms which the body offers to the passage of the current. Scientific American Supplement, No. 433, April 19, 1884 On changing the battery to 5 elements the resistance fell instantly to 30 ohms, and there remained. Scientific American Supplement, No. 492, June 6, 1885 A few turns more would provide the additional thirty ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. I have obtained with piles arranged like those shown in the figures nearly 0.06 ohm, the measurements having been taken from a newly charged pile. Scientific American Supplement, No. 385, May 19, 1883 Or the same given battery will bring a wire whose total resistance is 4 ohms to the same temperature as straight wire. Edison, His Life and Inventions Our readers can judge this resistance best when we state that the Atlantic cable offers a resistance of 8,000 ohms. Scientific American Supplement, No. 433, April 19, 1884 This is done by a solenoid, V, which has two coils, the one of thick wire offering no resistance, and the other of 2,000 ohms resistance. Scientific American Supplement, No. 360, November 25, 1882 The unit of the latter is the ohm; of the former the mho. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The platinum strip employed was 5 inches long and 1/8 inch wide, its resistance being 0.42 ohm, cold. Scientific American Supplement, No. 363, December 16, 1882 By increasing the battery from eight to twelve cells we get a spark when the vibrating magnet is shunted with 3 ohms. Edison, His Life and Inventions Taking an ordinary condition of the body, with the hands perspiring as usual, we would have the resistance equal to 10,000 ohms. Scientific American Supplement, No. 433, April 19, 1884 S conveys the main current, and is wound with thick wire having practically no resistance, and S' is traversed by a shunt current, and is wound with fine wire having a resistance of 600 ohms. Scientific American Supplement, No. 360, November 25, 1882 A conductor having a resistance of 100 ohms has a conductivity of .01 mho. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The potential of one cell is from 1.9 to 2 volts with strong solution, and the internal resistance varies from 0.108 to 0.170 of an ohm with cells of the size described. Scientific American Supplement, No. 363, December 16, 1882 We put in resistance up to 500,000 ohms, and the twitching was still perceptible. Edison, His Life and Inventions We measure weights or forces by comparison with some generally known and accepted unit standard weights, lengths, areas, and volumes, by comparison with a unit length, resistance by a standard ohm, and so forth. Scientific American Supplement, No. 433, April 19, 1884 Resistance of One yard of copper wire, one-eighth of an inch diameter………………………….0.002 ohms. Scientific American Supplement, No. 288, July 9, 1881 Its internal resistance is comparatively high, seldom falling below 1 ohm and often rising to 6 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The electromotive force of such a cell is 1.03 volts, and a current equivalent to one volt passing through a resistance of one ohm was found to decompose 0.00146 grain of water in one second. Scientific American Supplement, No. 275, April 9, 1881 "But we have a metal of such good conducting qualities that, without making the wire too large for convenient use, we have reduced the resistance to an ohm to the mile." Daybreak; a Romance of an Old World It is measured as a resistance, that is, in ohms. The Radio Amateur's Hand Book Or, =square of current in webers x resistance of the part in ohms / 746. Scientific American Supplement, No. 288, July 9, 1881 The e.m.f. of a cell of this type is 1.03 volts and the external resistance varies with the age of the cell, being about 4 ohms at first. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. "Would you be so kind as tell me, sir, what's a ohm?" said the worthy Mr. Stiggins to me the other day. The Coming of the Friars The resistance of such a filament hot is about 200 ohms, and to produce a good light from it the battery or dynamo ought to give an electromotive force of at least 100 volts. The Story of Electricity JOULE.—The energy spent in 1 second by a flow of 1 ampere in 1 ohm. The Radio Amateur's Hand Book The little group in the machine shop was soon deep in the discussion of ohms, amperes, volts and currents, and, for a time, Tom almost forgot the message calling him to Philadelphia. Tom Swift and His Wireless Message: or, the castaways of Earthquake island The joint Page 56 reaction is expressed in ohms and is called impedance. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. I'm thinking that this man was a fool to talk about ohms when not even you knew what a ohm means. The Coming of the Friars A good lightning conductor should not have a higher electrical resistance than 10 ohms from the point to the ground, including the "earth" contact. The Story of Electricity WATT.—The power spent by a current of 1 ampere in a resistance of 1 ohm. The Radio Amateur's Hand Book The droning voice of the professor continued to wind itself slowly round and round the coils it spoke of, doubling, trebling, quadrupling its somnolent energy as the coil multiplied its ohms of resistance. A Portrait of the Artist as a Young Man In practice, this property needs to be intrinsically high, and usually is measured by millions of ohms resistance from the wire of a line to its mate or to the earth. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. No. 32, however, is very nearly of that resistance and if wound to exactly the same depth would give about 970 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Exceptionally good conductors have only about 5 ohms. The Story of Electricity You can get one wound to 1000 ohms resistance for $1.75 and this price includes a cord. The Radio Amateur's Hand Book In this coil, when connected for local battery work, the windings are connected in pairs in series, thus forming effectively two windings having about 120 ohms resistance each. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This result, times the ohms Page 162 per cubic inch, as given in the table, gives the resistance of the winding. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The ohm is the resistance of a thread of mercury at the temperature of melting ice, 14.4521 grams in mass, of uniform cross-section and a length of 106.300 centimeters. The Radio Amateur's Hand Book For example, if we know the electromotive force or difference of potential in volts and the resistance in ohms of an electric circuit, we can easily find the current in amperes. The Story of Electricity It is measured as a resistance, that is, in ohms. The Radio Amateur's Hand Book The volt is the electromotive force which produces a current of 1 ampere when steadily applied to a conductor the resistance of which is 1 ohm. The Radio Amateur's Hand Book Assume a case in which are required a spool and core of a given size with a winding of, say No. 25 single silk-covered wire, of a resistance of 50 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This coil usually has a resistance of about 75 ohms and the meaning of the ohmic resistance of a receiver and its bearing on the sensitiveness of it will be explained a little farther along. The Radio Amateur's Hand Book The joule is the energy spent in I second by a flow of 1 ampere in 1 ohm. The Radio Amateur's Hand Book Get a standard telephone induction coil that has a resistance of 500 or 750 ohms and this will cost you a couple of dollars. The Radio Amateur's Hand Book The Grid Leak Resistance.—It has the same resistance, namely 5,000 ohms as the one used with the 5 watt tube transmitter, but it is a little larger. The Radio Amateur's Hand Book The resistance is to be increased from 50 to 1,000 ohms, or twenty times its first value. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. As conductance is the reciprocal of resistance it is measured by the reciprocal ohm or mho. The Radio Amateur's Hand Book VOLT.—The electromotive force which produces a current of 1 ampere when steadily applied to a conductor the resistance of which is one ohm. The Radio Amateur's Hand Book The watt is the power spent by a current of 1 ampere in a resistance of 1 ohm. The Radio Amateur's Hand Book Then again the higher the resistance of the receivers the more sensitive they often are and those wound to as high a resistance as 3,200 ohms are made for use with the best sets. The Radio Amateur's Hand Book Therefore, the wire to be used must show in the table twenty times as many ohms per cubic inch as are shown in No. 25, the known first size. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A rheostat that has a resistance of 6 ohms and a current carrying capacity of 1.5 amperes which can be mounted on a panel board is the right kind to use. The Radio Amateur's Hand Book |
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