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Voltage and What is Voltage ?

The voltage between two points is a short name for the electrical force that would drive an electric current between those points. Specifically, voltage is equal to energy per unit charge. In the case of static electric fields, the voltage between two points is equal to the electrical potential difference between those points. In the more general case with electric and magnetic fields that vary with time, the terms are no longer synonymous.
Electric potential is the energy required to move a unit electric charge to a particular place in a static electric field.Voltage can be measured by a voltmeter. The unit of measurement is the volt.

What is voltage?
 Voltage should be more correctly called "potential difference". It is actually the electron moving force in electricity (emf) and the potential difference is responsible for the pushing and pulling of electrons or electric current through a circuit.

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