Electricity is not just something you buy in a battery. It is one of the basic ingredients of the Universe. Everything around us is made of invisible atoms, and the atoms contain particles that carry electric charge. Charge can be positive or negative. Particles with the same kind of charge repel each other, while opposite charges attract. When charges move, we get current electricity, which drives much of the modern world.
Electricity is a naturally occurring force that exists all around us. Humans have been aware of this force for many centuries. Ancient man believed that electricity was some form of magic because they did not understand it. Greek philosophers noticed that when a piece of amber was rubbed with cloth, it would attract pieces of straw. They recorded the first references to electrical effects, such as static electricity and lightning, over 2,500 years ago.
Now, electric power is usually produced by electric generators, but can also be supplied by chemical sources such as electric batteries. Electric power is generally supplied to businesses and homes by the electric power industry. Electric power is usually sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. The electric power industry provides the production and delivery of power, in sufficient quantities to areas that need electricity, through a grid connection. The grid distributes electrical energy to customers.
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