How do you keep cool in your house?
What sort of light do you use at night?
What appliances do you have in your home?
Anything that gives you heat or light uses energy.
Household appliances use energy. In your notebook, make a list of all the things in your kitchen that use energy. What kind of energy do you think each appliance uses?
Most homes receive a supply of electricity. The electricity travels along cables and wires from a power station. At the power station, electricity is usually made from the energy released by burning fossil fuels, or by using nuclear fuel or waterpower.
Fossil fuels developed from the remains of prehistoric plants and animals.
These fuels include coal, natural gas, and petroleum, from which we get oil. Wood, also, is often classified as a fossil fuel.
Besides electricity, fossil fuels are also used as a source of energy in our homes. Wood, coal, and oil can be burned to give heat. Natural gas can be burned for heating and cooking. Oil lamps and gasoline lanterns can be used as a source of light.
Other sources of energy in the home include solar energy and wind power.
Solar energy is energy from the sun, often gathered by solar panels. Solar energy can warm a house or heat up water. Wind power is often impractical unless there are strong, steady winds.
Fossil fuels are called nonrenewable sources
– of energy because, once they have been used up, they cannot be replaced. One day, all the coal, natural gas, and oil on earth may be used up. There will then be no more available.
Sources of energy that can be used over and over again are called renewable, or inexhaustible, sources.