Electricity is the flow of electrons from one atom to another. Scientists believe that electricity was first noted when ancient people discovered the attraction between an amber rod and other materials.

An understanding of electricity begins with the atom. Electrons travel in orbit around a nucleus composed of protons and neutrons. When an atom has the same number of protons and electrons, it has no charge. When it has more electrons than protons, it has a negative charge, and if more protons than electrons, a positive charge. As electrons move from one atom to another, electric current is produced.

A flow of electrons can be produced by different methods, including friction, heat, light, pressure, chemical action, and magnetism. The last two are used most often in agriculture.

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