Energy provides us with a means of using fun and convenient appliances. But what exactly is energy and where does it come from?
Scientists define energy as "the ability to do work." For example, we harness energy to run factories, provide heat and light in our homes and schools, power our cars and school busses, and many other things!
People can take energy from different sources: fossil fuels (gas, oil, coal), nuclear power, wind power (windmills), solar power (from the sun) hydroelectric power (water dams) and a few new innovative ways. Energy is very useful to us, but energy costs us money to use in our cars, homes, work, and schools. In addition, most of the energy people use comes from fossil fuels – and this causes a lot of pollution as well as other problems.