Electricity is an easily moved and very controllable source of energy, that is it is a source of making things work.
The most useful kind of electricity comes from plugs in the walls. It is called mains electricity. You can get most power from this source and run kettles, dishwashers and TVs.
But we also use batteries for low powered electricity in cars, in torches, in laptops, in iPods, mobile phones and so on.
