如图所示的电路中,电阻r1的阻值为10Ω,闭合开关s电流表a1的示数为2a,电流表a2的示数为0.8a
求(1)电源电压(2)r2的阻值(3)电路中总电阻(4)r2消耗的电功率(5)r1工作5min产生的热量...
求(1)电源电压(2)r2的阻值(3)电路中总电阻(4)r2消耗的电功率(5)r1工作5min产生的热量
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2015-01-25
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(1)r1电流=2-0.8=1.2,电源电压=r1 x 1.2a = 10 x 1.2 = 12V
(2)r2 = 12÷0.8 = 15
(3)总电阻 = 12÷2 = 6
(4)r2功率 = 12 x 0.8 = 9.6W
(5)r1热 = 12 x 1.2 x 5 x 60 = 4320J
(2)r2 = 12÷0.8 = 15
(3)总电阻 = 12÷2 = 6
(4)r2功率 = 12 x 0.8 = 9.6W
(5)r1热 = 12 x 1.2 x 5 x 60 = 4320J
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