Electromotive Force (emf)

Definition - What does Electromotive Force (emf) mean?

Electromotive Force (emf) is the voltage that is produced by any battery or electric energy. It is also known as Electric Potential and is measured in Volts. Thermocouple produces emf and is widely used in the oil and gas industry. In physics, emf is known as a source of energy due to which an electric current flows through an electrical device.

Petropedia explains Electromotive Force (emf)

Electromotive Force is converted into electrical energy reversibly from other forms of energies. EMF is usually energy per unit in a battery or a dynamo. To understand the corrosion and metallurgy in oil and gas, we need to understand the emf series. EMF series are arranged in terms relative to standard potentials.

The emf values of few metals are:

Magnesium – (+2.96), Aluminium – (+1.70) , Zinc – (+0.76), Iron – (+0.44), Nickle – (+0.23), Hydrogen – (0.00), Copper – (-0.34) and so on.

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