Question:medium
A battery of emf 21 V and internal resistance 3 \(\Omega\) is connected to a resistor. If the current in the circuit is 3 A, find:
(i) the resistance of the resistor, and
(ii) the terminal voltage of the battery.
A battery of emf 21 V and internal resistance 3 \(\Omega\) is connected to a resistor. If the current in the circuit is 3 A, find:
(i) the resistance of the resistor, and
(ii) the terminal voltage of the battery.
(i) the resistance of the resistor, and
(ii) the terminal voltage of the battery.
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Always double-check terminal voltage using \(V = IR\) and \(V = E - Ir\). If both match, your calculated value for the external resistance \(R\) is guaranteed to be 100% correct!
Updated On: Jul 2, 2026
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