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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 ?
Fires linked to heating, ventilation and cooling (HVAC) systems in the Hummer SUVs caused what GM called 'minor burns' to the three people, according to Reuters, but two of the three Hummer models in which people sustained the burns were entirely destroyed by the blazes.
Lynch Hummer buyers will be bound by the same legal requirements as any gun purchaser before they will receive their Browning Citori.
Clint Comelli, from Hummer Limousines Australia, which charges 500 dollars for an hour ride, said that the chance to party like a rock star was behind its new popularity.
GM's sale of Hummer is part of an effort by the Detroit-based firm to drop four unprofitable vehicle lines and emerge from bankruptcy a leaner company.
They were all so excited about it; it is a chance of a lifetime for them to go in a Hummer.
Despite the popularity of the Hummer, its running costs, fuel economy and carbon emissions have been called into question.
Fresh out of the College for Creative Studies in Detroit, Michigan, their test was to design a fun, nimble and innovative Hummer concept.
GM acquired the rights to the Hummer brand in late 1999, and since then sales have grown from around 1000 vehicles to more than 82,000 last year.
Since April of last year, Hummer H2 sales are down by 22 percent.
New Hummers are sold for about $100,000, while used vehicles cost $50,000-$70,000.
THE Hummer, a brawny US army 4x4 which first saw service in the Gulf War and is now a fashionable favourite of Arnold Schwarzenegger, is to be made cheaper and smaller.
ATLANTA, March 2 /PRNewswire/ -- With GM's efforts to sell Hummer stalling last week and the brand possibly headed to extinction, Chevrolet may be able capture the largest share of new Hummer buyers based on cross-shopping activity on AutoTrader.