Consider a circuit where a cell of emf \( E_0 \) and internal resistance \( r \) is connected across the terminal A and B as shown in the figure. The value of \( R \) for which the power generated in the circuit is maximum, is given by:
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The maximum power in a circuit occurs when the external resistance equals the internal resistance, i.e., R = r. For circuits involving both internal and external resistances, adjust accordingly for maximum power.