Four wires meet at a junction. The first carries 4A in to the junction, the second carries 5A out of the junction, and third carries 2A out of the junction. The fourth carries:
Correct answer: D. 3A in to the junction
- A. 7A out of the junction
- B. 7A into the junction
- C. 3A out of the junction
- D. 3A in to the junction
Explanation
D. Kirchoff's Junction rule states that the total current into a junction is equal to that out of the junction hence 3+4in = 5+2out
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