Foil Capacitors

Posted in Electronics by admin on January 17, 2010 No Comments yet

Energy Stored in a Capacitor?

A capacitor consists of two closely spaced metal conductors of large area, separated by a thin insulating foil. It has an electrical capacity of 3200 × 10-6 C/V ( F) and is charged to a potential difference of 87.0 V.

(a) Calculate the charge on this capacitor when the electrical energy stored in the capacitor is 9.73 J.

(b) If the two plates of the capacitor have their separation increased by a factor of 2 while the charge on the plates remains constant, by what factor is the energy stored in the capacitor increased?

a) Q = CV Just plug in the capacitance and the potential differences you were given. You could calculate it using the energy instead with U = Q^2/2C but you don't need it.

b) Epsilon * A/d = C

U = Q^2/2C

Q constant, so doubling separation halves capacitance, doubling the energy stored.

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