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发表于 2012-3-16 13:28
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本帖最后由 i886 于 2012-3-16 13:38 编辑
读不进书 发表于 2012-3-16 12:58
反电势是因为扬声器振动产生,是个正常的电路指标,没有反电势就没有振动,也就没有声音。楼主在谈的振铃信 ...
读书师兄, 一切降低内阻的, 不论长短, 材质; 内阻低了, 电感值也相对降低吧!
就算" 降低功放内阻和音圈的直流电阻 " 一样有反电动势, 在音箱里不至影响分频点, 但影响放音质素一定会有, 尤以低频更甚!
来这美国电磁研究网站玩玩: {:soso_e128:}
http://www.magnet.fsu.edu/educat ... /backemf/index.html
EMF in Inductors
EMF is an acronym for electromotive force. Scientists tend not to use the spelled-out version of this term, in part because it can be misleading: EMF is not, in fact, a force in the way physicists use the term. Rather, it’s the energy produced by the interaction between a current and a magnetic field when one (or both) is changing. It’s measured in volts, and is sometimes equated with voltage, or potential difference.
The tutorial below describes both EMF and a related phenomenon, back EMF (or counter EMF). EMF explains the sudden flashing of the light bulb in the illustrated circuit both when it is connected and disconnected.
# 图里演说了澈走电流后, 电感仍有残余反电动势的 #
The tutorial contains a simple circuit of a battery, knife switch and light bulb (acting as a resistor, resisting the flow of current). It also contains an inductor, in the form of a wire coil. Inductors store energy in the form of the magnetic fields that are generated around them by the current passing through the wire.
是叫你做网上的实时试验啊~{:soso_e106:}
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