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  2. Voltage converter - Wikipedia

    en.wikipedia.org/wiki/Voltage_converter

    Most single phase alternating-current electrical outlets in the world supply power at 210–240 V or at 100–120 V. A transformer or autotransformer can be used; (auto)transformers are inherently reversible, so the same transformer can be used to step the voltage up, or step it down by the same ratio. Lighter and smaller devices can be made ...

  3. Voltage optimisation - Wikipedia

    en.wikipedia.org/wiki/Voltage_optimisation

    Research in Taiwan [11] suggested that, for an industrial supply, for voltage reduction upstream of the transformer, there is a 0.241% decrease of energy consumption when the voltage is decreased by 1%, and an increase of 0.297% when the voltage is increased by 1%. This assumed a mixture of loads including 7% fluorescent lighting, 0.5% ...

  4. Scope soldering iron - Wikipedia

    en.wikipedia.org/wiki/Scope_soldering_iron

    The "Scope" soldering iron when marketed in Australia in 1950, retailed at 43/6 [4] (43 shillings and six pence, which converts to $4.35 before inflation), twice the price of a conventional iron. [5] A suitable transformer was marketed (which doubled as a stand for the iron), also a metal etching pen "Vibroscope", which used the same ...

  5. Power supply - Wikipedia

    en.wikipedia.org/wiki/Power_supply

    A very small low-power dummy load such as a ceramic power resistor or 10-watt light bulb can be attached to the supply to allow it to run with no primary load attached. The switch-mode power supplies used in computers have historically had low power factors and have also been significant sources of line interference (due to induced power line ...

  6. Voltage transformer - Wikipedia

    en.wikipedia.org/wiki/Voltage_transformer

    A capacitor voltage transformer (CVT), is a transformer used in power systems to step down extra high voltage signals and provide a low voltage signal to the actual VT (voltage transformer) used for operating metering/protective relays due to a lower cost than an electromagnetic PT. The circuit diagram for a simple capacitor voltage transformer

  7. Electric power distribution - Wikipedia

    en.wikipedia.org/wiki/Electric_power_distribution

    Most modern North American homes are wired to receive 240 volts from the transformer, and through the use of split-phase electrical power, can have both 120 volt receptacles and 240 volt receptacles. The 120 volts is typically used for lighting and most wall outlets. The 240 volt circuits are typically used for appliances requiring high watt ...

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