W1:W2=R1:R2=U1:U2还有W1:W2=R2:R1 怎么推导的

问题描述:

W1:W2=R1:R2=U1:U2还有W1:W2=R2:R1 怎么推导的

当I相同时,W1:W2=I^2R1:I^2R2=R1:R2,W1:W2=IU1:IU2=U1:U2;第二个,当U相同时,W1:W2=UI1:UI2=I1:I2=U/R1:U/R2=R2/R1