hum

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hum

Electronics an undesired low-frequency noise in the output of an amplifier or receiver, esp one caused by the power supply

Hum

 

the name given during the Middle Ages to the region between Dubrovnik and the Neretva River. The earliest surviving reference to Hum dates from the 10th century and describes the region as subject to the Serbian prince Mihajlo Višević. Late in that century the region became part of Samuil’s state, and in 1018 it fell under Byzantine control. Hum became part of Zeta in the second half of the 11th century, part of the Nemanja state in the late 12th century, and part of Bosnia in the 1320’s. Duke (herceg) Stepan Vukčić took control of Hum in the 1440’s. The duke’s dominions, of which Hum constituted a major part, became known as Hercegovina in the mid-15th century.

hum

[həm]
(electricity)
A sound produced by an iron core of a transformer due to loose laminations or magnetostrictive effects; the frequency of the sound is twice the power line frequency.
(electronics)
An electrical disturbance occurring at the power supply frequency or its harmonics, usually 60 or 120 hertz in the United States.
References in periodicals archive ?
There have been 42 reports of fires in the recalled Hummer models, 31 of them reported to the National Highway Traffic Safety Administration and 11 directly to General Motors.
The wind-down of Hummer is expected to take several months and GM said it would continue to honour warranties, and provide service support and spare parts to current owners.
It's most popular with boys between about 9 and 15 years but girls are starting to get in on it too, especially as we have a hot pink Hummer.
Mrs Petrovic booked the Hummer through World of Hummer, a London-based booking company that operates throughout the UK.
The Hummer design challenge gave our newest designers an opportunity to sprint.
7-litre, fivecylinder engine the Hummer H3 has permanent four-wheel-drive and is one of the most capable off-road vehicles you can buy.
General Motors' Hummer H2, which sells for $51,000 to $56,000, was introduced in 2002.
The corporate heads at the United Auto Group in Detroit wouldn't confirm it, but Dee Fiser, president of Fiser Truck and Tractor in Little Rock, did: He has sold his Hummer franchise, the only one in the state, to Landers Auto Sales to concentrate on his truck and tractor models including Kubota and Arctic Cat.
General Motors, which bought Hummer in 1999, is to launch a scaled-down version, the Hummer H2, to do battle with Jeep and Land Rover.
Tom Wynne, general manager, operations, at Mettiki said that the company owns 13 Hummers exclusively for mantrips and said that they "significantly reduced" travel times.
Although AM General speeded up its consumer marketing plan in reaction to demand created by the Persian Gulf war, AM General planned to sell civilian Hummers long before the first tire hit the sand in Saudi Arabia, says corporate communications director Craig MacNab.
Hummers, originally built by AM General, were initially designed as multipurpose, off-road military vehicles.