Engineering Board Exam Reviewer · RC Circuits · medium
In the series RC circuit shown, a 85 V (rms) source with =2000 rad/s is connected to R=75, and C=12.5, F. Find the voltage across the resistor.
- 55.4 V
- 45 V
- 85 V
- 75 V
Answer
D. 75 V
Solution
XC=1/ C= 1(2000)(12.5, F)=40, . |Z|=sqrt(R2+XC2)=sqrt((75, )2+(40, )2)=85, . I=V/|Z|= 85 V85, =1 A. VR=IR=(1 A)(75, )=75 V.
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