Question

EMF and Terminal Voltage​

Answer 1

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• The electromotive force (emf) is the potential difference of a source when no current is flowing. Terminal voltage is the voltage output of a device is measured across its terminals. Terminal voltage is calculated by V = emf - Ir.

• It is represented by “ε” and the measuring unit is same as voltage i.e. Volt. EMF is the maximum potential difference between two points of the battery when no current is flowing from the source in case of open circuit. In short, EMF is the cause and Voltage or potential difference is the effect.

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Answer 2

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The electromotive force (emf) is the potential difference of a source when no current is flowing. Terminal voltage is the voltage output of a device is measured across its terminals. Terminal voltage is calculated by V = emf - Ir. Terminal voltage of a battery can never be greater than the emf of the battery. Because due to internal resistance of the current termial