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  2. Voltage converter - Wikipedia

    en.wikipedia.org/wiki/Voltage_converter

    The output will usually be DC in the range 1.5–24 V. Power supplies that output either 100–120 V AC or 210–240 V AC are available; they are called inverters, due to the conversion from DC to AC rather than the voltage change. The output frequency and waveform of an inverter may not accurately replicate that supplied by mains electricity ...

  3. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    Simple LED circuit with resistor for current limiting. The current in an LED or other diodes rises exponentially with the applied voltage (see Shockley diode equation), so a small change in voltage can cause a large change in current. Current through the LED must be regulated by an external circuit such as a constant current source to prevent ...

  4. Megger Group Limited - Wikipedia

    en.wikipedia.org/wiki/Megger_Group_Limited

    High power Relay test set with user features 2003 Multi-function tester with ergonomic design 2005 Noise immune 10kV insulation tester 2007 Loop impedance in an RCCB electrical test circuit tester [48] 2009 Three-phase transformer turns ratio test sets (TTR) 2010 Transformer ohmmeter (MTO) 2010 Cable fault location system (PFL) 2011

  5. LED circuit - Wikipedia

    en.wikipedia.org/wiki/LED_circuit

    In 1969, Hewlett-Packard introduced the HP Model 5082-7000 Numeric Indicator, an early LED display and the first LED device to use integrated circuit technology. Its development was led by Howard C. Borden and Gerald P. Pighini at HP Associates and HP Labs, who had engaged in research and development (R&D) on practical LEDs between 1962 and ...

  6. Mains electricity by country - Wikipedia

    en.wikipedia.org/wiki/Mains_electricity_by_country

    400 V 50 Hz Jordan: B, C, D, F, G, J 230 V 400 V 50 Hz Kazakhstan: C, F 230 V 400 V 50 Hz 230/400 V voltage is defined in "GOST 29322-2014 Mezhgosudarstvennyi Standart Napryazheniya Standartnye". Kenya: G 240 V 415 V 50 Hz Kiribati: I AS/NZS 3112 230 V 400 V 50 Hz Kosovo: C, F [50] 230 V 400 V 50 Hz Kuwait: C, G 240 V 415 V

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  8. Light-emitting diode physics - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode_physics

    United States Department of Energy (DOE) testing of commercial LED lamps designed to replace incandescent lamps or CFLs showed that average efficacy was still about 46 lm/W in 2009 (tested performance ranged from 17 lm/W to 79 lm/W).

  9. List of railway electrification systems - Wikipedia

    en.wikipedia.org/wiki/List_of_railway...

    1907–1908, raised to 1,200 V [25] 700 United States: New York Metro-North Railroad: Hudson and Harlem Lines, southern part of New Haven Line. Original New York Central Railroad electrification scheme to Grand Central Terminal. Philadelphia SEPTA – Market–Frankford Line: Originally 600 V, raised to 700 V 825 Belarus: Minsk: Minsk Metro

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