Electrical energy is energy transfer due to an electric current.
Uses of electrical devices include heating, lighting, making objects move (using an electric motor) and creating sound and visual images.
Electrical appliances can transfer electrical energy into useful energy at the flick of a switch.
An electrical appliance is designed for a particular purpose and should waste as little energy as possible.
The unit of power is the watt (W) equal to 1 J/s.
1 kilowatt (kW)=…