Question

The expression for the current in an RC circuit is?

(a) i=(V/R)e^t/RC

(b) i=(V/R)e^-t/RC

(c) i=(V/R)(1-e^-t/RC)

(d) i=(V/R) (1-e^t/RC)

This question was addressed to me in unit test.

I want to ask this question from Transients in CR Networks topic in section Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

Right choice is (b) i=(V/R)e^-t/RC

Easy explanation: Applying KVL to the given circuit, we get:

i=i0e^-t/RC = (100/10)e^-t/100

i=10 e^-t/100.