Engineering Board Exam Reviewer · RC Circuits · medium
In a series RC circuit, the voltage across the resistor is 30 V and the voltage across the capacitor is 40 V. What is the source voltage?
- 70 V
- 50 V
- 10 V
- 35 V
Answer
B. 50 V
Solution
VR and VC are 90° out of phase, so they add as phasors: VS=sqrt(VR2+VC2)=sqrt(302+402)=50 V.
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