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  4. A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. The current in the circuit is 0.5 A, The terminal voltage of the battery when the circuit is closed is

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Q. A battery of emf 10 V and internal resistance $ 3\,\Omega $ is connected to a resistor. The current in the circuit is 0.5 A, The terminal voltage of the battery when the circuit is closed is

JamiaJamia 2008

Solution:

Terminal voltage of the battery after closing the circuit is $ V=E-ir $ $ =10-0.5\times 3 $ $ =10-1.5 $ $ =8.5V $