根据 P=I^2R
I=U/(R1+R2)
P=U^2R1/(R1+R2)^2=U^2R1/[(R1-R2)^2+4R1R2]
当R1=R2 可变电阻与定值电阻阻值相等时,功率最大
Pm=U^2/4R1=U^2/4R2
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