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  2. Power inverter - Wikipedia

    en.wikipedia.org/wiki/Power_inverter

    A power inverter, inverter, or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). [1] The resulting AC frequency obtained depends on the particular device employed. Inverters do the opposite of rectifiers which were originally large electromechanical devices converting AC to DC.

  3. United States five-hundred-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_five-hundred...

    United States five-hundred-dollar bill. 1928 US$500 Gold Certificate. The United States five-hundred-dollar bill(US$500) (1861–1945) is an obsolete denomination of United States currency. Since 1969 banks are required to send $500 bills to the United States Department of the Treasury for destruction.

  4. Electric generator - Wikipedia

    en.wikipedia.org/wiki/Electric_generator

    In electricity generation, a generator[1] is a device that converts motion-based power (potential and kinetic energy) or fuel-based power (chemical energy) into electric power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines and even ...

  5. Inverter-based resource - Wikipedia

    en.wikipedia.org/wiki/Inverter-based_resource

    Inverter-based resource. An inverter-based resource (IBR) is a source of electricity that is asynchronously connected to the electrical grid via an electronic power converter ("inverter"). The devices in this category, also known as converter interfaced generation (CIG), include the variable renewable energy generators (wind, solar) and battery ...

  6. Synchronverter - Wikipedia

    en.wikipedia.org/wiki/Synchronverter

    A simple diagram of synchronverter operation environment. Synchronverters or virtual synchronous generators[1][2] are inverters which mimic synchronous generators (SG) [3] to provide "synthetic inertia" for ancillary services in electric power systems. [4] Inertia is a property of standard synchronous generators associated with the rotating ...

  7. Single-line diagram - Wikipedia

    en.wikipedia.org/wiki/Single-line_diagram

    In power engineering, a single-line diagram (SLD), also sometimes called one-line diagram, is a simplest symbolic representation of an electric power system. [1][2] A single line in the diagram typically corresponds to more than one physical conductor: in a direct current system the line includes the supply and return paths, in a three-phase ...

  8. History of the United States dollar - Wikipedia

    en.wikipedia.org/wiki/History_of_the_United...

    The new $20 bills entered circulation on October 9, 2003, and the new $50 bills on September 28, 2004. The new $10 notes were introduced in 2006 and redesigned $5 bills began to circulate March 13, 2008. Each has subtle elements of different colors but are still primarily green and black.

  9. Banknotes of the United States dollar - Wikipedia

    en.wikipedia.org/wiki/Banknotes_of_the_United...

    They switched to small size in 1929 and are the only type of currency in circulation today in the United States. They were originally printed in denominations of $5, $10, $20, $50, $100, $500, $1,000, $5,000 and $10,000. The $500, $1,000, $5,000 and $10,000 denominations were last printed in 1945 and discontinued in 1969, making the $100 bill ...

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