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[单选题]
一个电阻负载两端电压为U,流过的电流为I。它的电阻R和所消耗的功率P分别为:(U、I、R、P的单位分别为伏特、安培、欧姆、瓦特,”x^m”表示“x的m次方”)()
A.R = U/I,P = U×I
B. R = I / U,P = U^2/I
C. R = U×I,P = U/ I^2
D. R = U^2/I,P = U^2×I
查看答案
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A.R = U/I,P = U×I
B. R = I / U,P = U^2/I
C. R = U×I,P = U/ I^2
D. R = U^2/I,P = U^2×I
A.导体的电阻与其两端所加的电压成正比
B.导体的电阻与流过字的电流成反比
C.导体的电阻与U、I无关
D.导体的电阻与其两端所加的电压成反比
A.I = U/R,P = U^2/R
B. I = U×R,P =U/R
C. I = R/U,P =U×R
D. I = U×R,P =U^2×R