L是标有3V,0.75W的灯泡,R等于20欧,当S1断开,S2闭合时,L恰能正常发光.求:(1)当S1闭合,S2断开时,电阻R发热功率.(2)当S1,S2断开时,灯L实际功率.
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![L是标有3V,0.75W的灯泡,R等于20欧,当S1断开,S2闭合时,L恰能正常发光.求:(1)当S1闭合,S2断开时,电阻R发热功率.(2)当S1,S2断开时,灯L实际功率.](/uploads/image/z/13793925-21-5.jpg?t=L%E6%98%AF%E6%A0%87%E6%9C%893V%2C0.75W%E7%9A%84%E7%81%AF%E6%B3%A1%2CR%E7%AD%89%E4%BA%8E20%E6%AC%A7%2C%E5%BD%93S1%E6%96%AD%E5%BC%80%2CS2%E9%97%AD%E5%90%88%E6%97%B6%2CL%E6%81%B0%E8%83%BD%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89.%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E5%BD%93S1%E9%97%AD%E5%90%88%2CS2%E6%96%AD%E5%BC%80%E6%97%B6%2C%E7%94%B5%E9%98%BBR%E5%8F%91%E7%83%AD%E5%8A%9F%E7%8E%87.%EF%BC%882%EF%BC%89%E5%BD%93S1%2CS2%E6%96%AD%E5%BC%80%E6%97%B6%2C%E7%81%AFL%E5%AE%9E%E9%99%85%E5%8A%9F%E7%8E%87.)
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