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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Basic Question
Hi,
Have small question about basic electric theory concerning induction. For example I know that a wire moving through a magnetic field will induce an emf. However will an electric field also induce an emf if a wire moves through it? Would this effect be what makes fluorescent lamps glow underneath power distribution lines? Asimov ****** .... Just a little force field zap. |
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Basic Question
"Asimov" wrote in
: Hi, Have small question about basic electric theory concerning induction. For example I know that a wire moving through a magnetic field will induce an emf. However will an electric field also induce an emf if a wire moves through it? Would this effect be what makes fluorescent lamps glow underneath power distribution lines? Asimov ****** ... Just a little force field zap. A fluorescent tube works by an electric field inside the tube causing a discharge, and this electric field can come either, as normally, from applying a mains voltage across the tube, or from the electric field produced by a power line. So fluorescent tubes will produce a visible glow under a power line, though usually it is only visible after dark as it is much weaker than the light they normally produce. The current through a fluorescent tube under a power line would probably be 20 – 200 microamps (µA) depending on the field. This is much less than a person can normally perceive, so you can hold the tube yourself under the power line without it hurting. (For comparison, a 10 W tube at 230 V draws 40 mA – 200 times greater). You can sometimes also make a fluorescent tube produce visible flickers by holding one end and rubbing your foot on a carpet to generate static electricity, though again, this needs to be done in a dark room. http://www.emfs.info/sci_EffectsOnEquip.asp Electromagnetic Induction info http://makeashorterlink.com/?A24A431E7 A Google search or a decent textbook should also help. |
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