Engineering Board Exam Reviewer · Series Circuits · hard
The circuit shown has V=12 V, R1=60, , and R3=4, . The ammeter reads 100 mA. Find the unknown resistance Rx.
- 56,
- 120,
- 184,
- 64,
Answer
A. 56,
Solution
Total resistance: RT=V/I= 12 V100 mA=120, . The known resistors total 64, , so Rx=RT-64, =56, .
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