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Dynamo
A dynamo is an electrical generator that produces direct current with the use of a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter. Today, the simpler alternator dominates large scale power generation, for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator. Also, converting alternating to direct current using power rectification devices (vacuum tube or more recently solid state) is effective and usually economical.
==Etymology==
The word ''dynamo'' (from the Greek word dynamis, meaning power) was originally another name for an electrical generator, and still has some regional usage as a replacement for the word ''generator''. After the invention of the AC Generator and that alternating current can be used as a power supply, the word ''dynamo'' became associated exclusively with the ''commutated direct current electric generator'', while an AC electrical generator using either slip rings or rotor magnets would become known as an alternator.
A small electrical generator built into the hub of a bicycle wheel to power lights is called a hub dynamo, although these are invariably AC devices, and are actually magnetos.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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