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Initially, when the switch in a series RL circuit is closed, the inductor acts as?

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+1 vote
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in Basic Electrical Engineering by (88.7k points)
Initially, when the switch in a series RL circuit is closed, the inductor acts as?

(a) Open circuit

(b) Short circuit

(c) Resistor

(d) Capacitor

This question was addressed to me by my school principal while I was bunking the class.

Query is from Transients in LR Networks topic in section Inductance in a DC Circuit of Basic Electrical Engineering

1 Answer

+2 votes
by (506k points)
Right answer is (a) Open circuit

Explanation: Before switch is closed, current in inductor is zero. When the switch in a series RL circuit is closed, current in the inductor remains zero since current in inductor doesn’t change suddenly. So, the inductor acts as an open circuit.

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