| 单词 | capacitance |
| 例句 | We define their capacitance C to be such that the charge Q stored in a capacitor is proportional to C . College Physics for AP Courses 2015-08-12T00:00:00Z The tuning knob varies the capacitance of the capacitor, which in turn tunes the radio. Calculus, Volume 3 2016-03-30T00:00:00Z The large lumens and relatively thin walls of veins make them far more distensible than arteries; thus, they are said to be capacitance vessels. Anatomy and Physiology 2013-06-19T00:00:00Z The majority of mobile devices use capacitive touchscreen layers, which detect a change in capacitance when a finger or other conductive element touches the screen. Apple may replace iPhone home button with fingerprint-scanning screen 2017-02-15T05:00:00Z But many devices, particularly smartphones and tablets, now use a system that relies on capacitance. The moving finger moves on 2016-01-28T05:00:00Z Not only does the smaller d make the capacitance greater, but many insulators can withstand greater electric fields than air before breaking down. College Physics for AP Courses 2015-08-12T00:00:00Z Rather than taking digital images, they measure a fingertip’s electrical current, or capacitance, to capture a fingerprint image. What Could Criminals Do with 5.6 Million Fingerprint Files? 2015-09-30T04:00:00Z Formation of highly porous carbon aerogel around the fibers increased their surface area and specific capacitance by three orders of magnitude and also provided additional benefits to the mechanical properties. Car Outsides Made to Power Auto Insides 2014-07-01T04:00:00Z It works by recording a drop in the sensor's capacitance - its ability to store an electrical charge - caused by it being deformed by the buckling of the skin's surface. Researchers create goosebump sensor 2014-06-25T04:00:00Z The software in a chip which controls the screen detects the position of the change in capacitance and uses it to determine the finger’s location. The moving finger moves on 2016-01-28T05:00:00Z If a dielectric is used, perhaps by placing Teflon between the plates of the capacitor in Example 19.8, then the capacitance is greater by the factor κ , which for Teflon is 2.1. College Physics for AP Courses 2015-08-12T00:00:00Z First, it reduces the parasitic capacitance of the circuit. Researchers Build World's Fastest Carbon Nanotube Transistor 2013-05-07T21:20:40Z Touching an area of carbomorph with your finger changes the local capacitance in a way that is easily detectable by an appropriate electrical circuit. 3D printing: Your flexible friend 2012-12-13T16:07:42Z The charging device, made of a coiled wire with capacitance plates on either end, uses electricity to create a magnetic field that resonates at a specific frequency. Recharge and Roll: Electric Car-Makers Plan to Cut the Cord 2011-10-28T11:15:00.190Z The patches would monitor the capacitance of particular regions and feed data to a computer, registering any changes. A new age in monitoring infrastructure 2011-10-10T10:00:00Z So the same capacitor filled with Teflon has a greater capacitance and can be subjected to a much greater voltage. College Physics for AP Courses 2015-08-12T00:00:00Z Parasitic capacitance occurs when two electric currents are near enough to each other that they interfere with one another. Researchers Build World's Fastest Carbon Nanotube Transistor 2013-05-07T21:20:40Z A result is that a property known as the capacitance decreases, which in turn raises the voltage between the two electrodes. Power Walk, Gain a Watt 2011-08-23T22:18:56Z This change in frequency is achieved by varying the electrical capacitance in the tuned circuit of the oscillator. LRL Accelerators The 184-Inch Synchrocyclotron He stood up and placed a finger on a capacitance switch. The Standardized Man The capacitor stores the same charge for a smaller voltage, implying that it has a larger capacitance because of the dielectric. College Physics for AP Courses 2015-08-12T00:00:00Z FARAD.—The capacitance of a condenser in which a potential difference of 1 volt causes it to have a charge of 1 coulomb of electricity. The Radio Amateur's Hand Book So when the solid electrode was pushed down, compressing the liquid droplets, or pushed laterally over the top of them, the device produced a very large capacitance and voltage. Power Walk, Gain a Watt 2011-08-23T22:18:56Z As the blades of the tuning forks vibrate, the capacitance is alternately increased and decreased by the required amount. LRL Accelerators The 184-Inch Synchrocyclotron The energy is in joules for a charge in coulombs, voltage in volts, and capacitance in farads. College Physics for AP Courses 2015-08-12T00:00:00Z Another way to understand how a dielectric increases capacitance is to consider its effect on the electric field inside the capacitor. College Physics for AP Courses 2015-08-12T00:00:00Z Filter Condenser.—A condenser of large capacitance used in combination with a filter reactor for smoothing out the pulsating direct currents as they come from the rectifier. The Radio Amateur's Hand Book The energy is in joules when the charge is in coulombs, voltage is in volts, and capacitance is in farads. College Physics for AP Courses 2015-08-12T00:00:00Z Use the characteristics of the Coulomb force to explain why capacitance should be proportional to the plate area of a capacitor. College Physics for AP Courses 2015-08-12T00:00:00Z Similarly, explain why capacitance should be inversely proportional to the separation between plates. College Physics for AP Courses 2015-08-12T00:00:00Z Similarly, a small capacitance requires less time to discharge, since less charge is stored. College Physics for AP Courses 2015-08-12T00:00:00Z Coils wound with their turns parallel and having a number of layers have a bunched capacitance which produces untoward effects in oscillation circuits. The Radio Amateur's Hand Book Give the reason why a dielectric material increases capacitance compared with what it would be with air between the plates of a capacitor. College Physics for AP Courses 2015-08-12T00:00:00Z Find the total capacitance of the combination of capacitors shown in Figure 19.40. College Physics for AP Courses 2015-08-12T00:00:00Z Find the total capacitance of the combination of capacitors shown in Figure 19.41. College Physics for AP Courses 2015-08-12T00:00:00Z Calculate the four RC time constants possible from connecting the resulting capacitance and resistance in series. College Physics for AP Courses 2015-08-12T00:00:00Z CAPACITY, DISTRIBUTED.—A coil of wire not only has inductance, but also a certain small capacitance. The Radio Amateur's Hand Book Among the things to be considered are the applied voltage and whether it should vary with energy to be delivered, the range of energies involved, and the capacitance of the defibrillator. College Physics for AP Courses 2015-08-12T00:00:00Z However, matters become more complex when capacitance is involved. College Physics for AP Courses 2015-08-12T00:00:00Z Would you use a large inductance or a large capacitance in series with a system to filter out low frequencies, such as the 100 Hz hum in a sound system? College Physics for AP Courses 2015-08-12T00:00:00Z What must the capacitance be at this frequency? College Physics for AP Courses 2015-08-12T00:00:00Z In honeycomb and other stagger wound coils the capacitance is more evenly distributed. The Radio Amateur's Hand Book A parallel plate capacitor must have a large area to have a capacitance approaching a farad. College Physics for AP Courses 2015-08-12T00:00:00Z This small value for the capacitance indicates how difficult it is to make a device with a large capacitance. College Physics for AP Courses 2015-08-12T00:00:00Z The total capacitance of this equivalent single capacitor depends both on the individual capacitors and how they are connected. College Physics for AP Courses 2015-08-12T00:00:00Z The resistance of a resistor, and the capacitance of a capacitor, can be understood from the basic properties of electric fields and forces, as well as the properties of materials and their geometry. College Physics for AP Courses 2015-08-12T00:00:00Z The farad is the capacitance of a condenser in which a potential difference of 1 volt causes it to have a charge of 1 coulomb of electricity. The Radio Amateur's Hand Book Series connections produce a total capacitance that is less than that of any of the individual capacitors. College Physics for AP Courses 2015-08-12T00:00:00Z Here the total capacitance is easier to find than in the series case. College Physics for AP Courses 2015-08-12T00:00:00Z To find the equivalent total capacitance Cp , we first note that the voltage across each capacitor is V , the same as that of the source, since they are connected directly to it through a conductor. College Physics for AP Courses 2015-08-12T00:00:00Z There are two simple and common types of connections, called series and parallel, for which we can easily calculate the total capacitance. College Physics for AP Courses 2015-08-12T00:00:00Z The variable condenser used in series with the aerial wire system has 26 plates and is equal to a capacitance of .0008 mfd. which is the normal aerial capacitance. The Radio Amateur's Hand Book What is the capacitance of a large Van de Graaff generator’s terminal, given that it stores 8.00 mC of charge at a voltage of 12.0 MV? College Physics for AP Courses 2015-08-12T00:00:00Z The resistance of a resistor, and the capacitance of a capacitor, can be understood from the basic properties of electric fields and forces, as well as the properties of materials and their geometry. College Physics for AP Courses 2015-08-12T00:00:00Z In terms of voltage, this is because voltage across the capacitor is given by Vc = Q / C , where Q is the amount of charge stored on each plate and C is the capacitance. College Physics for AP Courses 2015-08-12T00:00:00Z As for any capacitor, the capacitance of the combination is related to charge and voltage by C = Q . College Physics for AP Courses 2015-08-12T00:00:00Z The condenser used in the secondary coil circuit has 14 plates and this is equal to a capacitance of .0004 mfd. The Radio Amateur's Hand Book If the capacitance in the defibrillation unit is fixed, how would you manipulate resistance in the circuit to adjust the RC constant τ ? College Physics for AP Courses 2015-08-12T00:00:00Z XC is inversely proportional to the capacitance C ; the larger the capacitor, the greater the charge it can store and the greater the current that can flow. College Physics for AP Courses 2015-08-12T00:00:00Z The great advantage of using an oscillation transformer instead of a simple inductance coil is that the capacitance of the closed circuit can be very much larger than that of the aerial wire system. The Radio Amateur's Hand Book It is a general feature of series connections of capacitors that the total capacitance is less than any of the individual capacitances. College Physics for AP Courses 2015-08-12T00:00:00Z It is shown at C. The other three condensers, see D, are also of the fixed type and may have a capacitance of .001 mfd.; The Radio Amateur's Hand Book The capacitance of a condenser or a circuit is the quantity of electricity which will raise its pressure, or potential, to a given amount. The Radio Amateur's Hand Book Likewise, by varying the capacitance and the inductance of the receptor the circuits can be tuned to receive incoming electric waves of whatever length within the limitation of the apparatus. The Radio Amateur's Hand Book Likewise an oscillation circuit has a natural frequency which depends upon its inductance, capacitance and resistance. The Radio Amateur's Hand Book To find the total capacitance of such combinations, we identify series and parallel parts, compute their capacitances, and then find the total. College Physics for AP Courses 2015-08-12T00:00:00Z A fixed condenser of the exact capacitance required for connecting across the head phones is mounted in a base fitted with binding posts, as shown at B, and costs 75 cents. The Radio Amateur's Hand Book The capacitance of a condenser or a circuit is directly proportional to the quantity of electricity that will keep the charge at a given potential. 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 The total capacitance is, thus, the sum of CS and C3 . College Physics for AP Courses 2015-08-12T00:00:00Z In simple electric resonance an oscillating current of a given frequency flowing in a circuit having the proper inductance and capacitance may increase the voltage until it is several times greater than its normal value. The Radio Amateur's Hand Book What Capacitance Is.—The word capacitance means the electrostatic capacity of a condenser or a circuit. The Radio Amateur's Hand Book The capacitance of a condenser or a circuit depends on its size and form and the voltage of the current that is charging it. The Radio Amateur's Hand Book |
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