Renewable energy is generally considered as being from an energy resource that is replaced rapidly by a natural process such as power generated from the sun or from the wind. Most renewable forms of energy, other than geothermal and wave power, ultimately come from the sun. Visible light can be converted directly to electricity by devices called solar cells. There are two different types of solar cells – photovoltaic cells and Grätzel cells. In this activity students make their own Grätzel cells and use them to power a calculator.

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