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  2. Frequency changer - Wikipedia

    en.wikipedia.org/wiki/Frequency_changer

    Often airplanes use 400 Hz power so a 50 Hz or 60 Hz to 400 Hz frequency converter is needed for use in the ground power unit used to power the airplane while it is on the ground. Airlines might also utilize the converters to provide in-air wall current to passengers for use with laptops and the like.

  3. Utility frequency - Wikipedia

    en.wikipedia.org/wiki/Utility_frequency

    Brazil underwent a frequency conversion program to 60 Hz that was not completed until 1978. [14] In Mexico, areas operating on 50 Hz grid were converted during the 1970s, uniting the country under 60 Hz. [15] In Japan, the western part of the country (Nagoya and west) uses 60 Hz and the eastern part (Tokyo and east) uses 50 Hz.

  4. Electric power conversion - Wikipedia

    en.wikipedia.org/wiki/Electric_power_conversion

    Aircraft often use 400 Hz power internally, so 50 Hz or 60 Hz to 400 Hz frequency conversion is needed for use in the ground power unit used to power the airplane while it is on the ground. Conversely, internal 400 Hz internal power may be converted to 50 Hz or 60 Hz for convenience power outlets available to passengers during flight.

  5. Mains electricity by country - Wikipedia

    en.wikipedia.org/wiki/Mains_electricity_by_country

    Frequency and voltage supplied to most premises by country. ... 60 Hz 50 Hz [33] Conversion of 50 Hz distribution to 60 Hz is ongoing. [34]

  6. Frequency conversion - Wikipedia

    en.wikipedia.org/wiki/Frequency_conversion

    Frequency conversion may refer to different processes affecting frequency of physical phenomena: A frequency changer, an electronic device that converts alternating ...

  7. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.

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