如如图所示,R1=10Ω,闭合开关后,电流表A的示数为0.6A,R2的电功率为2.4W.求: (1)电压电压; (2)通电100s,R2消耗的电能.

问题描述:

如如图所示,R1=10Ω,闭合开关后,电流表A的示数为0.6A,R2的电功率为2.4W.求:

(1)电压电压;
(2)通电100s,R2消耗的电能.

(1)∵R1与R2并联
∴U=U1=U2=IR1=0.6A×10Ω=6V
答:电源电压为6V.
(2)W=P2t=2.4W×100s=240J
答:通电100S,R2消耗的电能为240J.