Physics P1.3

P1 3.1

Electrical appliances are useful because you can transfer energy really quickly as soon as you turn on a switch.

Electrical appliances include: lamps, electric mixers, speakers and televisions.

Appliances should be created to waste as little energy as possible.

P1 3.2

Power is the rate at which something transfers energy. Power is measured in Watts (W) when talking about appliance power because power will be referred to later with a different meaning.

Power = Energy / Time

Efficiency of power = useful power out / total power in

P1 3.3

Power, when charged with money, is measured in kilowatt-hours (kWh). A kilowatt-hour is a measurement of the amount…