MCQ
Calculate the value of current $I_4$
- A$-9A$
- ✓$9A$
- C$5A$
- D$1A$
✓
Answer
Correct option: B.
$9A$
Current $I_4$ can be calculated using Kirchhoff’s first law. The sum of current arriving at a junction is equal to the currents leaving the junction.
Here, Currents arriving at a junction: $7A + 5A = 12A$
Currents leaving the junction: $3A + I_4$
Equating both the currents: $12A = 3A +I_4$
$I_4 = 9A$
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