An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than propulsion. They are commonly found on large aircraft, as well as some large land vehicles. Aircraft APU generally produce 115V at 400 Hz (rather than 50/60 Hz in mains supply), to run the electrical systems of the aircraft; others can produce 28V DC. APUs are also present on naval ships. APUs can provide power through single- or 3-phase systems.
Read more about Auxiliary Power Unit: Military Aircraft, Spacecraft, Armor, Commercial Vehicles, Other Forms of Transport
Famous quotes containing the words power and/or unit:
“The power of consumer goods ... has been engendered by the so-called liberal and progressive demands of freedom, and, by appropriating them, has emptied them of their meaning, and changed their nature.”
—Pier Paolo Pasolini (1922–1975)
“During the Suffragette revolt of 1913 I ... [urged] that what was needed was not the vote, but a constitutional amendment enacting that all representative bodies shall consist of women and men in equal numbers, whether elected or nominated or coopted or registered or picked up in the street like a coroner’s jury. In the case of elected bodies the only way of effecting this is by the Coupled Vote. The representative unit must not be a man or a woman but a man and a woman.”
—George Bernard Shaw (1856–1950)