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The frequency of an Alternating Current electrical system is most often expressed in hertz (Hz). The hertz is the unit used to express number of cycles per second in an oscillating or vibrating system.

European countries, including Great Britain, generally employ a 50 Hz system, the US employs a 60 Hz system. Spacecraft AC systems often operate at much higher frequencies, for example the Apollo spacecraft employed a 400Hz AC electrical system.

For comparison, 'Concert A', the tuning reference for classical instruments, varies between 440 Hz and 443 Hz

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