Question
State Kirchhoff’s rules. Use these rules to write the expressions for the currents I1, I2 and I3 in the circuit diagram shown.
✓
Answer
- Junction rule: At any junction, the sum of the currents entering the junction is equal to the sum of currents leaving the junction.
- Loop rule: The algebraic sum of changes in potential, around any closed loop, involving resistors and cells in the loop, is zero.
Expressions for the currents I1, I2 and I3 using given loop.
- I3 = I2 + I1
- 4I1 – 3I2 + 1 = 0
- 3I2 + 2I3 – 3 = 0.
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