Engineering Board Exam Reviewer · RL Circuits · medium
In the parallel RL circuit shown, a 480 V (rms) source with =500 rad/s feeds R=30, and L=80 mH in parallel. By how many degrees does the total current lag the source voltage?
- 36.9°
- 53.1°
- 45°
- 90°
Answer
A. 36.9°
Solution
XL= L=(500)(80 mH)=40, . IR=V/R= 480 V30, =16 A, IL=V/XL= 480 V40, =12 A. = -1!≤ft(IL/IR )= -1!≤ft( 12 A16 A )=36.9°.
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