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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: How does capacitance change with voltage? posted by John PA on July 2, 2007 at 11:29:14:
A Fared is actually not a unit of energy, rather is the amount of charge the capacitor holds when charged to a volt. F=Q/V. In other words 1 Fared is a Coulomb per Volt. The total energy that the capacitor can store is .5CV^2, the integral of the charge curve.
The capacitance is essentially constant at all voltages, the capacitor's voltage rating is the upper limit that can be applied without risking punching through the dielectric. For practical uses, they are independent variables.
Typically, the maximum voltage in the circuit is known and relatively constant, so just choose a cap with a working voltage above that voltage and choose a value of capacitance to provide the desired energy storage at the voltage you are using.
Rick
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- RE: How does capacitance change with voltage? - rick_m 11:57:17 07/02/07 (0)
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