In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
Correct answer: A. R3 is open
- A. R3 is open
- B. R1 is open
- C. R2 is open
- D. the circuit is operating properly
Explanation
If all branches were conducting, the total current would be 12 + 15 + 25 = 52 mA. The measured 27 mA equals 12 + 15 mA, showing that the 25 mA branch through R3 is open.
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