There are lots of different ways. For use in our homes, we tend to use either a battery (for small things) or a generator, which is what you get in a power station that provides the electricity that we use from a mains (wall) socket. Batteries use a chemical reaction that causes one half of the battery to become positively charged and the other half negatively charged, pushing electrons around the device that has the battery in it (creating electricity). Generators use something discovered by Michael Faraday almost 200 years ago – if you have a magnet and an electrical circuit, then just moving the circuit about next to the magnet produces electricity. This is so ridiculously useful! Because it means we can convert movement into electricity. Most power stations do this by rotating a big magnet inside a wire to generate electricity. (e.g. Think of a wind turbine. The wind blows the arms around and this rotation is used to turn a magnet around.)
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