State Kirchhoff’s rules. Use these rules to write the expressions… - Vidyadip

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.

Expressions for the currents $I_1, I_2$ and $I_3$ using given loop.
$I_3 = I_2 + I_1$
$4I_1 – 3I_2 + 1 = 0$
$3I_2 + 2I_3 – 3 = 0.$

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