Electrical Energy and Power

Electric Power for A-Levels

Electrical work

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)

Electrical power

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:

material editor: Josephine Emmanuel