Question
Calculate the current drawn from the battery in the given network shown here. State Kirchhoff’s loop law and name the law on which it is based.

Answer

The equivalent circuit is as shown in figure alongside. [$\therefore$ Bridge is in balanced condition, no current flows through $5\Omega$ resistance] $\frac{1}{\text{R}}=\frac{1}{5}+\frac15\text{R}=5\Omega$
Current in the circuit $=\frac{6}{2.5}\text{A}=2.4\text{A}$ Kirchhoff’s Loop Law: The algebraic sum of potential differences of different circuit elements of a closed circuit (or mesh) is zero. This law is based on law of conservation of energy.

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