Question
State Kirchhoff’s rules. Use these rules to write the expressions for the currents $I_1, I_2$ and $I_3$ in the circuit diagram shown.
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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.
- $I_3 = I_2 + I_1$
- $4I_1 – 3I_2 + 1 = 0$
- $3I_2 + 2I_3 – 3 = 0.$
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