Why do transformers ''hum''?
by 
Ec-nal Licensed Bootie Inspector
ANSWERS: 6
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This is an educated guess. I won't go into all the physics of a transformer, but suffice it to say that they contain wire coiled around a solid metal core. Utility power is Alternating Current at 60Hz, meaning that the current flow reverses its direction 60 times each second. When current flows through a wire, a small magnetic field is created, and that field's direction is determined by the direction the current is flowing. When the wire is coiled, the magnetic field is multiplied by the number of turns in the coil. With a coil of sufficient size (such as would be used to step-down utility power to 120 V), that magnetic field can be quite powerful. This magnetic field interacts with all of the other parts in the transformer, and since it is reversing its direction 60 times / second, it sets up a 60Hz vibration, which probably causes the sound you're hearing.
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The robots in disguise are trying to get out.
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Cause they don't know the words to the songs playing on the car radio.
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The current in a transformer is alternating, usually at 50hz or 60hz. So it is turning on and off a strong magnetic field at twice that frequency. The transformer has a metal core which is actually squeezed, mechanically compressed, by the magnetic field, and then released. This movement results in a sound, in just the same way as a loudspeaker does.
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simple its the current flow going tho the winding's in the transformer its magnetic theory Master Electrician 20 years
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Anytime you change the state of energy something get wasted. The humming and the heat transformers give off is wasted energy. That is why you should unplug wall wart transformers when they are not in use. Bill Lutz Generation 3 Electric, Inc. www.Generation3electric.com http://electrician-in-philadelphia.blogspot.com/
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