In the chapter, Electric potential energy, We found that the work 
of the force that moves a charge 
from the equipotential plane 
to the equipotential plane 
is given as:
In the equation, we considered that the voltage 
is equal to the potential difference.
If we insert the expression for the electric charge (
) we get:
The unit of work is 
(Joule) or 
(Watt second)
Electric power is work per unit time:
The unit of power is 
(Joule per second) or 
(Watt).
Using equation 1 and Ohm's law 
, we can write the power formula in three forms:
Let's also write the formula for work in all forms:
