Electromotive force (Cambridge (CIE) IGCSE Co-ordinated Sciences (Double Award)) : Revision Note
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Electromotive force
Extended tier only
Electromotive force (e.m.f.) is the name given to the potential difference of the power source in a circuit
It is defined as
The electrical work done by a source in moving a unit charge around a complete circuit
Electromotive force (e.m.f.) is measured in volts (V)

The e.m.f. is the voltage supplied by a power supply: 12 V in the above case
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