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Why is the terminal voltage of …

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Why is the terminal voltage of a cell less than its emf

    • Posted by Suraj Kumar Yadav 6 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Gaurav Seth 6 years, 3 months ago

    Because emf is the potential difference across the two terminals of a voltage source when it is not connected to any circuit. And once it is connected to a circuit, the voltage reduces slightly because of the internal resistance of the voltage source.

    The terminal voltage of the voltage source is the potential difference across the terminals when it is connected to a circuit.

    That is why the emf of a cell is always greater than its terminal voltage.

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