An electronic flash unit for a camera contains a capacitor with acapacitance of

Question

An electronic flash unit for a camera contains a capacitor with acapacitance of 900 µF. When theunit is fully charged and ready for operation the potentialdifference between the capacitor plates is 430 V. (a) What is the magnitude of the charge on eachplate of the fully charged capacitor?
C
(b) Find the energy stored in the "charged-up" flash unit.
2 J
(a) What is the magnitude of the charge on eachplate of the fully charged capacitor?
C
(b) Find the energy stored in the "charged-up" flash unit.
2 J

Explanation / Answer

Capacitance C = 900 * 10 ^ -6 F Potential differencde V = 430 V (a). Magnitude of charge Q = CV                                           = 3.87 * 10 ^ -1 C = 0.387 C (b). Energ stored E = ( 1/ 2) C V ^ 2                               = 1.849* 10 ^ -1 J                               = 0.1849 J

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