天气预报 > 其他 > 几个电阻并联后的总电阻等于
几个电阻并联后的总电阻等于
更新时间: 2020-10-28 00:00:00  

几个电阻并联后总电阻等于各电阻的倒数之和,这句话是错误。应该说在并联电路中,总电阻等于各支路电阻的倒数只和。你说的这句话就好比有一条支路上串联了两个电阻,总电阻就不是各电阻的倒数之和了。而是把串联的两个加起来的倒数,主要是讲各个支路而不是各个电阻。<br>并联电路电压:由于各个支路一段连接在一起,另一端也连接在一起,承受同一电源的电压,所以各支路的电压是相同的,并联电路电流:由于各个支路电压相等,根据欧姆定律便可知电阻小的支路电流大;电阻大的支路电流小。即并联各支路的电流与对应的电阻成反比分配。

关键词: 电阻 并联 等于

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