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82问答网 > 2835⼀12v⼀60珠的LED灯条，电阻是100欧，怎么计算一颗灯珠是多少W

2835⼀12v⼀60珠的LED灯条，电阻是100欧，怎么计算一颗灯珠是多少W

2025-03-14 20:48:14

推荐回答（1个）

回答1：

2835灯珠一般是0.2W的，如果你已经有实物了，那可以实测：给灯珠通上额定电压12V，测100欧姆电阻两端压降，就可以知道流过100欧姆电阻的电流（电流=电压/电阻），也就知道灯珠的电流，然后再测出一个灯珠两端的电压（一般在3V左右），将此电压与灯珠电流相乘就得出了灯珠此时的实际功率。
计算的话，若按灯珠电压3V考虑，假如灯珠是3串的话，那么电阻两端的电压就是12V-3*3V=3V，灯珠的电流则为：3V/100欧姆=30mA,灯珠的功率为：3V*30mA=0.09W,明显比一般的0.2W小啦。

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