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  2. Dynamo - Wikipedia

    en.wikipedia.org/wiki/Dynamo

    "Dynamo Electric Machine" (end view, partly section, U.S. patent 284,110) A dynamo is an electrical generator that creates direct current using 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 ...

  3. Electric generator - Wikipedia

    en.wikipedia.org/wiki/Electric_generator

    Dynamos generate pulsing direct current through the use of a commutator. Alternators generate alternating current. Mechanically, a generator consists of a rotating part and a stationary part which together form a magnetic circuit: Rotor: The rotating part of an electrical machine.

  4. Gramme machine - Wikipedia

    en.wikipedia.org/wiki/Gramme_machine

    A Gramme machine, Gramme ring, Gramme magneto, or Gramme dynamo is an electrical generator that produces direct current, named for its Belgian inventor, Zénobe Gramme, and was built as either a dynamo or a magneto. [1] It was the first generator to produce power on a commercial scale for industry.

  5. Direct current - Wikipedia

    en.wikipedia.org/wiki/Direct_current

    Types of direct current. The term DC is used to refer to power systems that use only one electrical polarity of voltage or current, and to refer to the constant, zero-frequency, or slowly varying local mean value of a voltage or current. [9] For example, the voltage across a DC voltage source is constant as is the current through a direct ...

  6. History of electric power transmission - Wikipedia

    en.wikipedia.org/wiki/History_of_electric_power...

    The California Electric Company (now PG&E) in San Francisco in 1879 used two direct current generators from Charles Brush's company to supply multiple customers with power for their arc lamps. This San Francisco system was the first case of a utility selling electricity from a central plant to multiple customers via transmission lines. [ 11 ]

  7. Homopolar generator - Wikipedia

    en.wikipedia.org/wiki/Homopolar_generator

    A homopolar generator is a DC electrical generator comprising an electrically conductive disc ... and led the way for commutated direct current dynamos and then ...

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