2006-06-28 02:33:39 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Voltage applied to the primary coil of a transfer causes an electrical current to begin to flow, and that causes a magnetic field to form. As the voltage drops back to zero and reverses, the field collapses and then forms in the opposite direction. This changing magnetic field induces a voltage in the secondary coil. If that coil is connected to some load, the voltage causes current to flow.
If the ferromagnetic core which concentrates and contains the magnetic field is laminated, and there is some room for these laminations to move, they move in response to the changing magnetic field. If there is no movable magnetic material in the field, you hear nothing.
It need not be harmonic. It depends only on how the magnetic material is affected by the force applied to it by the magnetic field, and that field depends on the variation of the applied voltage with time. It need not be the sinusoidal pattern at 50/60 Hz of commercial power mains. In a switching power supply, it's a square wave.
2006-06-28 04:06:28 · answer #1 · answered by Frank N 7 · 0⤊ 0⤋
AC voltage is a sine wave when plotted against time (in an ideal world). In the real world however, it resembles a sine wave and is made up of many wave-forms added up together. To put it simply, voltage is made up of a number of components or "harmonics". Of particular interest to you is the 3rd harmonic, which causes the noise during the voltage transformation from one level to the next.
2006-06-29 11:40:36 · answer #2 · answered by steve951 1 · 0⤊ 0⤋
Check and make sure the people inside the transformer arent attracted to each other.
2006-06-28 02:37:24 · answer #3 · answered by kakitakodashiku 1 · 0⤊ 0⤋
This is the harmonic vibration of the laminar core that is a function of frequency of alternating current. Jules, lecturer. Australia.
2006-06-28 02:39:09 · answer #4 · answered by Jules G 6 · 0⤊ 0⤋
you're splendid and additionally you're on the splendid highway ,often times you are able to cut back a fit in a block of polystyrene and in high quality condition it in that to silence it.even nonetheless be conscious yoy shouldn't try this in spite of if that's getting warm as burning styrene emits a poisonous gas.
2016-12-08 13:29:14 · answer #5 · answered by kareen 4 · 0⤊ 0⤋
Somebody is transmitting microwaves down the AC wire?
2006-06-28 10:53:29 · answer #6 · answered by Balthor 5 · 0⤊ 0⤋