Question

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?

Answer 1

`V=60\;volt\\`

Step-by-step explanation:

Given,

`C=45\;mF\\R=120\;\Omega\\i=0.5\;A`

By the ohm's law,

`V=iR\\V=0.5times120\\V=60\;volt\\`

Answer 2

60 V

Step-by-step 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