题目内容
电路如图所示,=10V,R=5Ω,以下叙述正确的是()。
2021-01-08
A.电压源发出功率20W,电阻吸收功率20W
B.电压源吸收功率20W,电阻发出功率20W
C.电压源发出功率500W,电阻吸收功率500W
D.电压源吸收功率500W,电阻发出功率500W
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