How long will it take to completely charge a 0.047 µF capacitor through a 1 MΩ resistor?
A)0.029 s
B)0.047 s
C)0.235 s
D)0.47 s

Question

Quizplus · Accepted Answer

The time constant τ for an RC circuit is given by τ = R * C. Here, R = 1 MΩ and C = 0.047 µF. So, τ = 1,000,000 Ω * 0.000000047 F = 0.047 s. A capacitor is considered fully charged after about 5 time constants, so 5 * 0.047 s = 0.235 s.

How Long Will It Take to Completely Charge a 0