Electromotive Force

Electromotive Force

1. In a circuit, electromotive force is the energy per unit charge converted from the other forms of energy into electrical energy to move the charge across the whole circuit.
   In equation,
   $$E=\frac{W}{Q}$$
   where
   E = e.m.f.,
   W = energy converted from non-electrical forms to electrical form
   Q = positive charge.

2. The unit of e.m.f. is JC^-1 or V (Volt)
3. The unit of e.m.f. is JC^-1 or V (Volt). Electromotive force of 1 Volt means that 1 Joule of electrical energy is supplied to the circuit to move 1 Coulomd of charge across the whole circuit.