Question

What is the potential difference between the plates of a 2.9-f capacitor that stores sufficient energy to operate a 75.0-w light bulb for one minute?

Answer 1

Q = I t charge * time where I = charge / time

Q = V * C where Q is the charge stored on capacitor C

V C = I t

V = I t / C = 75 C/s * 60 sec / 2.9 farad = 1552 Volts

Note: farad = Coul / (J / Coul) = Coul^2 / J