How long will it take a 1 µF capacitor to completely discharge through a 47 kΩ resistor?
A)47 s
B)47 ms
C)235 ms
D)235 s

Name: How long will it take a 1 µF capacitor to completely discharge through a 47 kΩ resistor? A)47 s B)47 ms C)235 ms D)235 s
Brand: Quizplus
Rating: 4.9 (38 reviews)

Question

Quizplus · Accepted Answer

The time constant τ for an RC circuit is given by τ = R*C. Here, R = 47 kΩ and C = 1 µF, so τ = 47,000 * 0.000001 = 0.047 seconds or 47 ms. A capacitor is considered to be fully discharged after about 5 time constants, so 5 * 47 ms = 235 ms.

How Long Will It Take a 1 µF Capacitor to Completely