Answer Posted / khilendra pant
power=V*I, Voltage is electric potential energy per unit
charge, measured in joules per coulomb ( = volts). It is
often referred to as "electric potential", which then must
be distinguished from electric potential energy by noting
that the "potential" is a "per-unit-charge" quantity. Like
mechanical potential energy, the zero of potential can be
chosen at any point, so the difference in voltage is the
quantity which is physically meaningful. The difference in
voltage measured when moving from point A to point B is
equal to the work which would have to be done, per unit
charge, against the electric field to move the charge from
A to B.
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