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191问答库 > 电灯是电压越大越亮还是电流越大越亮? 说明原因

电灯是电压越大越亮还是电流越大越亮? 说明原因

2025-03-15 06:52:39

推荐回答（1个）

回答1：

都是.
从准确角度来说,是电流越大灯越亮.因为电压高时,如果电路有故障,灯泡照样不亮.而如果通过灯泡的电流加大了,灯泡一定更亮了.
电压只是诱因,最终起作用的还是电流.灯丝发光的本质原因是电流的热效应造成灯丝的温度很高,从而发光的.
灯丝的电阻不变,如果想提高电流,就必须提高电压.I=U/R,P=I^2R

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