The charging time constant of a circuit consisting of an inductor is the time taken for the current in the inductor to become __________% of the initial current.(a) 33(b) 63(c) 37(d) 36This question was posed to me in an interview.This intriguing question comes from Growth in an Inductive Circuit in division Inductance in a DC Circuit of Basic Electrical Engineering

The charging time constant of a circuit consisting of an inductor is t

1.	The charging time constant of a circuit consisting of an inductor is the time taken for the current in the inductor to become __________% of the initial current.(a) 33(b) 63(c) 37(d) 36This question was posed to me in an interview.This intriguing question comes from Growth in an Inductive Circuit in division Inductance in a DC Circuit of Basic Electrical Engineering
Answer» Correct OPTION is (B) 63 Easiest explanation: We know that: i=i0(1-e^-tR/L). When t=L/R, we have: i=i0(1-e^-1) = 0.63*i0. Hence the TIME CONSTANT is the time taken for the current in an inductive circuit to BECOME 0.63 times its initial current.

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