Engineering Board Exam Reviewer · Parallel Circuits · hard
The parallel circuit shown has V=15 V, R2=30, , and R3=20, , and the source delivers a total current of 1.5 A. Find the unknown resistance Rx.
- 10,
- 60,
- 20,
- 120,
Answer
B. 60,
Solution
The known branches carry 1.25 A. The remaining current through Rx is 1.5 A-1.25 A=250 mA, so Rx=V/Ix= 15 V250 mA=60, .
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