Engineering Board Exam Reviewer · RLC Circuits and Resonance · medium
A parallel RLC circuit is shown with R=100, , L=200 mH, and C=5, F, driven by a variable-frequency 120 V rms source tuned to the resonant frequency of the circuit. What total current does the source supply?
- 1.2 A
- 0.6 A
- 0.4 A
- 1.34 A
Answer
A. 1.2 A
Solution
At resonance XL=XC=sqrt(L/C)=200, , so IL=IC and they cancel in the line. Only the resistor current remains: IT=V/R= 120 V100, =1.2 A.
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