However, electrical energy must be changed into other forms of energy before we can use it. The symbol for power is \(P\), it is measured in Watts (\(W\)). The symbol for energy is \(E\), it is ...

Power is measured in watts (W), energy in joules (J) and time in seconds (s). 1 W = 1 J/s (1 watt is 1 joule per second.) Electrical power can be calculated using the equation.