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自感是一种常见的物理现象,又是一种特殊的电磁感应现象,按课本上的原理图,各校都配备有通电自感和断电自感的两块示教板,通电自感的实验效果较好,而断电自感却很不明显,即用6V的电源给如图小灯泡通电正常发光后,断电瞬间不易看到灯泡滞后熄灭的结果.这时,改用人体代替小灯,问学生:一节干电池电动势多高?用手触它的正负极可怕吗?谁都知道不可怕.“但现在我要让一节电池使你们触电,敢于亲身
Self-inductance is a common physical phenomenon, and it is also a special electromagnetic induction phenomenon. According to the textbook diagram, each school is equipped with two teaching boards with self-induction and self-inductance. The experimental results are good, but the power-off self-inductance is very inconspicuous, that is, with a 6V power supply to light a normal light bulb as shown in the figure, it is not easy to see the light bulb lagging out at the moment of power-off. At this time, instead of using the human body instead The lamp asks the student: How high is a battery-powered electromotive force? Is it terrible to use a hand to touch it? Everyone knows it’s not terrible. "But now I’m going to have a battery to make you get an electric shock and be personal