Engineering Board Exam Reviewer · RC Circuits · medium
In the parallel RC circuit shown, a 480 V (rms) source with =10000 rad/s feeds R=48, and C=5, F in parallel. By how many degrees does the total current lead the source voltage?
- 22.6°
- 45°
- 90°
- 67.4°
Answer
D. 67.4°
Solution
XC=1/ C= 1(10000)(5, F)=20, . IR=V/R= 480 V48, =10 A, IC=V/XC= 480 V20, =24 A. = -1!≤ft(IC/IR )= -1!≤ft( 24 A10 A )=67.4°.
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