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please explain to me what is e.m.f.

e.m.f. stands for electromotive force.
It is the work done per unit charge (Joules per Coulomb) by an electric field when electric charge goes from point A to point B. It is measured in Volts.
1 Volt = 1 Joule/Coulomb

If A and B are points in a circuit, the emf is the voltage difference between those points.

ok, and it is used in thermocouple thermometers right?

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