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116问答网 > 100欧⼀40W和100欧25W的两个电阻串联时，允许加的最大电压是多少，怎么求

100欧⼀40W和100欧25W的两个电阻串联时，允许加的最大电压是多少，怎么求

2025-03-16 07:19:11

推荐回答（1个）

回答1：

由P=UI得到I=P/U分别求两个电阻允许通过的最大电流： I1=P1/R1=40W/100Ω=0.4A， I2=P2/U2=25W/100Ω=0.25A；则串联电路允许的最大电流是：I允=I2=0.25A. 由R=R1+R2求串联电路的总电阻： R=R1+R2=100Ω+100Ω=200Ω，由I=U/R得到U=IR求允许加在串联电路两端的最大电压： U允=I允R=0.25A×200Ω=50V。

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