并联电路的电阻R=R1R2/(R1+R2)
总功率P=U^2/R=U^2(R1+R2)/R1R2
R1上消耗的功率P1=U^2/R1
R2上消耗的功率P2=U^2/R2
P1+P2=U^2/R1+U^2/R2=U^2(R1+R2)/R1R2=P
故得证.
请及时给予采纳.有问题另行提问.我会随时帮助你.
并联电路的电阻R=R1R2/(R1+R2)
总功率P=U^2/R=U^2(R1+R2)/R1R2
R1上消耗的功率P1=U^2/R1
R2上消耗的功率P2=U^2/R2
P1+P2=U^2/R1+U^2/R2=U^2(R1+R2)/R1R2=P
故得证.
请及时给予采纳.有问题另行提问.我会随时帮助你.