Potential Difference 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