When you are shopping in a supermarket, you probably think that you will spend lots of money and time in shopping. Sometimes, you will find that all the lights that keep the supermarket bright. Think about all the water taps in the toilet. Think about all the air conditioning in summer. Saving energy is a hot topic for such a big place!
Many things at the supermarket use energy. Electric lights, infrared taps and air conditioning need electricity to work. One way to save energy is by keeping lights clean. More and more dust and dirt make the lights less bright. When supermarkets keep lights clean, they can use fewer lights and keep the area just as bright. Using fewer lights means using less energy.
When you turn on the water tap, the water starts to flow. You don't have to touch a thing. Why do supermarkets have such special taps? The answer is simple. They save water. Sometimes people forget to turn off the water tap after they wash. Infrared taps turn themselves off.
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