电阻R1=6欧和R2=12欧并联在电路中,测得R1消耗的电功率是6瓦,求:(1)R1两端的电压是多少?(2)R1和R2消耗的总电功率是多少?

问题描述:

电阻R1=6欧和R2=12欧并联在电路中,测得R1消耗的电功率是6瓦,求:(1)R1两端的电压是多少?(2)R1和R2消耗的总电功率是多少?

(1)∵R1=6Ω,P1=6W,∴R1两端的电压为:U1=P1•R1=6Ω×6W=6V.答:R1两端的电压是6V.(2)电阻R1与R2并联,可知:U=U2=U1=6V,∵R2=12Ω,∴P2=U22R2=(6V)212Ω=3W,则R1和R2消耗的总电功率是:P=P1+P2=6W+3W=9...