Engineering Board Exam Reviewer · RC Circuits · medium
In the series RC circuit shown, a 340 V (rms) source with =5000 rad/s is connected to R=150, and C=2.5, F. Find the apparent power supplied by the source.
- 600 VA
- 320 VA
- 771 VA
- 680 VA
Answer
D. 680 VA
Solution
XC=1/ C= 1(5000)(2.5, F)=80, . |Z|=sqrt(R2+XC2)=sqrt((150, )2+(80, )2)=170, . I=V/|Z|= 340 V170, =2 A. S=VI=(340 V)(2 A)=680 VA.
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