The amount of energy an electrical device uses when performing a function is measured in watts. The average number of watts used in a household varies with the size of the house and the number of electrical appliances.
Approximately 3,000 to 5,000 watts are necessary for basic household needs. This includes lighting, cooking and refrigerating food. Additional electrical devices for entertainment, heating and other uses are added to this minimum requirement.
A 90 cm (36 inch) screen size television requires about 133 watts, while a DVD/CD player uses 100 watts. A personal computer with a 43 cm (17 inch) monitor requires 800 watts.
An average water heater uses 4,000 watts, while a tumble dryer requires 2,000 or more watts. Portable heaters use 750 or more watts and hair dryers require at least 1,200 watts.
Other electrical devices
A clock radio requires 10 watts and a coffee maker uses 900 or more watts. A clothes iron requires a minimum of 1,000 watts while a toaster requires 800 or more watts. The owner's manual lists the wattage required by the device.