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There are different types of generators. The basic one is an electrical generator. It is a machine that changes stored mechanical energy to electrical energy. The mechanical energy used may come from a variety of sources. This energy comes from a steam-powered turbine engine, a combustion engine or a wind-powered turbine, and creates the needed force to power a generator. Other power sources may be a waterwheel or a hand crank.

The generator uses electromagnetic induction in processing electricity. This machine pushes electrical charges to go to an external circuit. It does not, however, create electricity or the charge. These aspects are already present in its wire windings. The generator is quite similar with the water pump, which makes water flow, but does not make its own water. Home owners buy portable electric generators in case of power failures. These devices are often man-powered, and people store the electricity on rechargeable batteries.

Electrostatic generators were common before electromagnetic generators were discovered. It produces very high voltage and low current. This is inefficient; they produce low power ratings and corporations never used them for wide scale power generation.

A physicist and chemist named Michael Faraday discovered the principle behind electromagnetic generators. This principle is now named after him, called the Faraday’s Law. It explains that whenever an electrical conductor perpendicularly moves to a magnetic field, the ends of the conductor will generate a potential difference. This led to the discovery of the first electromagnetic generator, called the Faraday disc.