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11 September, 22:47

Which is true? An ideal emf device has internal resistance and a real emf device does not. A real emf device sets up a potential difference and an ideal emf device does not. An ideal emf device sets up a potential difference and a real emf device does not. A real emf device has internal resistance and an ideal emf device does not.

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  1. 11 September, 23:40
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    A real emf device has internal resistance and an ideal emf device does not.
  2. 12 September, 02:02
    0
    A real emf device has internal resistance and an ideal emf device does not

    Explanation:

    What is EMF?

    The electromotive force or potential difference or voltage is the reason behind the flow of current in a circuit.

    What is Ideal emf device?

    The ideal emf device is one which doesn't have any internal resistance and it provides a fixed emf regardless of the load current.

    What is Real emf device?

    But nothing is ideal in real world, A real emf device would have some internal resistance in series with the emf device.

    Conclusion:

    The internal resistance causes voltage drop therefore, as the load current changes, the voltage drop changes and hence device emf changes.
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