I attach a voltage source to a 45 mF capacitor until it is fully charged. I then take the voltage source away and discharge the capacitor through a 120 Ω resistor in a basic RC circuit. If the initial current through the circuit during discharge is 0.5 A, what voltage did I apply to the capacitor to charge it?

60 V

Explanation:

Let the potential on capacitor be V . This will be equal to voltage of the source .

During discharge this voltage of capacitor will create current .

V / 120 = .5

V = 60 V

So this would have been the voltage of the source . So voltage of source

= 60 V

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