| 单词 | microfarad |
| 例句 | 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 The farad being inconveniently large for practical use, one-millionth of a farad, called a microfarad, is generally adopted. 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 electrical capacity of the whole earth considered as a sphere is about 800 microfarads. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z They are prevented from passing to ground through the telephone set when the receiver is on the hook by a .05 microfarad condenser in series with the howler. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Then we would say that the condenser had a capacity of one microfarad. Letters of a Radio-Engineer to His Son The instrument maker's quart Leyden jar has a capacity of about one-five hundredth of a microfarad, but it occupies about 150 cubic inches or more. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Perhaps the 25 microfarad, 12 volt electrolytic condenser could be used to feed the pigeons, substituting a breadcrumb capacitor in the sidewalk circuit. The Foreign Hand Tie This may be reduced to electro-magnetic units by dividing by 9x10^20, and to microfarads by further multiplying by 10^15. On Laboratory Arts This is accomplished by bridging a considerable capacity across the supply pairs at the private exchange—ten to twelve microfarads usually suffice. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. 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 Thus, a coil may give a ten-inch spark if worked alone, but on a capacity of one-thirtieth of a microfarad it may not be able to give more than a five-millimetre spark. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z A condenser, C, of 2 microfarads capacity is also introduced between the key and earth. Scientific American Supplement, No. 443, June 28, 1884 It made use of two condensers of 1 microfarad each, one in each side of the cord circuit. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Capacitance is measured in terms of the microfarad. The Radio Amateur's Hand Book The frequency to which a circuit is tuned depends upon the product of the number of mil-henries in the coil and the number of microfarads in the condenser. Letters of a Radio-Engineer to His Son The electrostatic capacity of a condenser formed of two metal surfaces a foot square separated by glass three millimetres in thickness is between 1/360 and 1/400 of a microfarad. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The condensers ordinarily used in telephone practice range in capacity from about 1/4 microfarad to 2 microfarads. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Page 275 A one-half microfarad condenser is placed in the receiver circuit at each station so that the line will not be tied up should some subscriber inadvertently leave his receiver off its hook. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. To the + electrode of the A battery connect the - or zinc pole of the B battery and connect the + or carbon pole of the latter with one post of the fixed .001 microfarad condenser. The Radio Amateur's Hand Book As this unit is inconveniently large, for practical applications the unit microfarad—millionth of a farad—is employed. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. If quantities are known in microfarads and are to be used in calculations in which the values of the capacity require to be farads, care should be taken to introduce the proper corrective factor. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Since the farad is far too large for practical purposes a millionth of a farad, or microfarad, whose symbol is mfd., is used. The Radio Amateur's Hand Book When larger capacities than 2 microfarads are desired, they may be obtained by connecting several of the smaller size condensers in multiple. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Connect the other end of this wire with one post of a .001 microfarad variable condenser and connect the other post with the ground as shown in Fig. The Radio Amateur's Hand Book A sectional high tension condenser like the one described in connection with Set No. 1 can be used with this set but it must have a capacitance of not more than .007 microfarad. The Radio Amateur's Hand Book The High Tension Condenser.—Since, if you are an amateur, you can only send out waves that are 200 meters in length, you can only use a condenser that has a capacitance of .007 microfarad. The Radio Amateur's Hand Book |
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