ENERGY Energy is the ability to do work. Moving, lifting, heating and lighting are all examples of work. We can't see or touch energy but we can see its effects. We use energy to light our cities, heat our homes, move our cars, cook our food, play our music and give us pictures on television. Energy from the Sun gives us light and heat. When we eat, our bodies transform the energy stored in our food into energy to do work Everything we do is connected with energy in one form or another. There are two types on energy sources: non-renewable sources and renewable sources of energy. Non-renewable energy sources cannot be replenished in a short period of time. They will run out in the future. These energy sources are fossil fuelssuch as oil, coal and natural gas- and uranium. Renewable sources of energy can be replenished naturally in a short period of time. They don´t run out. Traditional examples of these energy sources are sunlight, wind and water. There are some new sources of renewable energy, such as biomass, which uses plants and other biological matter to produce energy.
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