Energy is used in every activity that we do, by our bodies to perform simple functions like walking to the store and by machines for extremely complex activities like powering an automobile or running a furnace to heat your home.
Plants are able to transform the energy of the sun into growth in their leaves, stems and fruit.
The sun s energy is also captured in fuels like oil, gasoline, and coal which are known as fossil fuels. These sources of energy will not run out and include such things as geothermal power, solar energy, hydropower, and wind power. Our homes are filled with large and small appliances that use energy to work for us. Toasters, microwave ovens, blenders, televisions, and radios are some examples of the small appliances we use everyday. Large energy users are furnaces, air conditioners, refrigerators, stoves and water heaters.