用一只调光台灯在1min内将灯泡两端电压由220V 降低到100V,通过的电流由0.25A降低到0.15A,灯泡消耗了180J的电能,可知在这1min时间内,电流通过灯丝做的功为A900J B1800J C1950J D3000J我也觉得是1800J,可是
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![用一只调光台灯在1min内将灯泡两端电压由220V 降低到100V,通过的电流由0.25A降低到0.15A,灯泡消耗了180J的电能,可知在这1min时间内,电流通过灯丝做的功为A900J B1800J C1950J D3000J我也觉得是1800J,可是](/uploads/image/z/7252010-26-0.jpg?t=%E7%94%A8%E4%B8%80%E5%8F%AA%E8%B0%83%E5%85%89%E5%8F%B0%E7%81%AF%E5%9C%A81min%E5%86%85%E5%B0%86%E7%81%AF%E6%B3%A1%E4%B8%A4%E7%AB%AF%E7%94%B5%E5%8E%8B%E7%94%B1220V+%E9%99%8D%E4%BD%8E%E5%88%B0100V%2C%E9%80%9A%E8%BF%87%E7%9A%84%E7%94%B5%E6%B5%81%E7%94%B10.25A%E9%99%8D%E4%BD%8E%E5%88%B00.15A%2C%E7%81%AF%E6%B3%A1%E6%B6%88%E8%80%97%E4%BA%86180J%E7%9A%84%E7%94%B5%E8%83%BD%2C%E5%8F%AF%E7%9F%A5%E5%9C%A8%E8%BF%991min%E6%97%B6%E9%97%B4%E5%86%85%2C%E7%94%B5%E6%B5%81%E9%80%9A%E8%BF%87%E7%81%AF%E4%B8%9D%E5%81%9A%E7%9A%84%E5%8A%9F%E4%B8%BAA900J+B1800J+C1950J+D3000J%E6%88%91%E4%B9%9F%E8%A7%89%E5%BE%97%E6%98%AF1800J%2C%E5%8F%AF%E6%98%AF)
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