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What is terminal potential differnce of ...

What is terminal potential differnce of a cell? Can its value be greater than the emf of a cell? Explian.

Text Solution

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Terminal potential difference of a cell is defined as the potential difference between the two electrodes of a cell in a closed circuit. The value of terminal potential difference of a cell is less than the emf of a cell, when current is drawn from the cell (i.e., during discahrging of cell). The value of terminal potential difference of a cell becomes greater than the emf of the cell during charging the cell, i.e., wehn the positive electode of the cell is connected to positive terminal of battery charger and nagative electrode of the cell is connected to negative terminal of battery charger.
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Knowledge Check

  • The terminal potential difference of a cell is greater than its emf when it is

    A
    being discharged
    B
    being charged
    C
    in open circuit
    D
    short circuited
  • Its value can be greater than one:

    A
    MPC
    B
    MPS
    C
    APS
    D
    APC
  • Assertion: Terminal potential difference of a cell is always less than its emf. Reason: Potential drop on internal resistance of cell increases terminal potential difference.

    A
    If both Assertion `&` Reason are True `&` the Reason is a correct explanantion of the Assertion
    B
    If both Assertion `&` Reason True but Reason is not a correct explanation of the Assertion
    C
    If Assertion is True but the Reason is False
    D
    If both Assertion `&` Reason are False.
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