Engineering Board Exam Reviewer · RL Circuits · medium
In a series RL circuit, the resistor voltage is 60 V and the inductor voltage is 80 V. What is the source voltage?
- 140 V
- 100 V
- 20 V
- 70 V
Answer
B. 100 V
Solution
VR and VL are 90° out of phase: VS=sqrt(VR2+VL2)=sqrt(602+802)=100 V.
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