Engineering Board Exam Reviewer · Time Response of Reactive Circuits · medium
The switch in the RL circuit shown closes at t=0 with no initial current (V=6 V, R=100, , L=200 mH). Find the voltage across the inductor at t=2 ms.
- 3.79 V
- 6 V
- 2.21 V
- 0.812 V
Answer
C. 2.21 V
Solution
The inductor voltage is vL=Ve-t/ with =L/R=2 ms. vL=6 V,e-2 ms/2 ms=2.21 V. (At t=0 the inductor takes the whole source voltage; it falls as the current builds up.)
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