Saturday, January 12, 2013

Electromotive Force

Electromotive Force is the energy supplied by a source of electric power in driving a unit charge around the circuit. The unit is the volt. A difference in charge between two points in a material can be created by an external energy source such as a battery. This causes electrons to move so that there is an excess of electrons at one point and a deficiency of electrons at a second point. This difference in charge is stored as electrical potential energy known as emf. It is the emf that causes a current to flow through a circuit.

1 comment:

  1. It is define as potential difference cross to terminal of a Cell or a a close circuit and no current drawn from it.