Question

How is EMF measured?

Answer 1

E.M.F. is the total energy provided by a cell to pass a unit of charge through the whole circuit, or it is described as the electric potential produced either by an electrochemical cell or by varying the magnetic field. E.M.F. is measured in volts which is the same as the potential difference.

Complete answer:
Electromotive force is described as the electric potential generated by either an electrochemical cell or by adjusting the magnetic field. EMF is the commonly utilized acronym for electromotive force.
A battery or a generator is used for the transformation of energy from one mode to another. In these devices, one end becomes positively charged while the opposite becomes negatively charged. Accordingly, an electromotive force is work performed on a unit electric charge.
Electromotive force is utilized in the electromagnetic flowmeter, which is the utilization of Faraday’s law. EMF is numerically denoted as the number of Joules of power given by the source shared by each Coulomb to allow a unit electric charge to flow across the circuit.
E.M.F. is estimated in volts which is the same as the potential difference. One volt is equivalent to the one Joule per Coulomb.

Note: EMF is different from the terminal voltage in such a way that terminal voltage is described as the potential difference over the ends of a load when the circuit is on. In comparison, EMF is defined as the maximum potential difference delivered by the battery when there is no current flow. A voltmeter is used to measure the terminal voltage, whereas a potentiometer is used to measure the EMF.