Question

An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the initial charging current.

(a) 100 microA

(b) 500 microA

(c) 400 microA

(d) 1000microA

The question was asked during an interview.

My query is from Discharge of a Capacitor Through a Resistor in section Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

The correct choice is (c) 400 microA

For explanation: In a series RC circuit, the initial charging current is:

I=V/R = 200/(0.5*10^6s) = 400*10^-6A = 400 microA.