Everyday electrical appliances are designed to bring about energy transfers. • The amount of energy an appliance transfers depends on how long the appliance is switched on for and the power of the appliance. • Students should be able to describe how different domestic appliances transfer energy from batteries or ac mains to the kinetic energy of electric motors or the energy of heating devices. • Students should be able to describe, with examples, the relationship between the power ratings for domestic electrical appliances and the changes in stored energy when they are in use.