如图所示,电源电动势E=10V,内阻r=1欧,电阻R2=2欧,灯A标有6V,6W,灯B标有4V,4W,求(1)若使灯B正常发光,R1应多大?(2)这时灯A的实际功率多大?(3)这时电源的输出功率多大?图是电源与R1串联在一起
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![如图所示,电源电动势E=10V,内阻r=1欧,电阻R2=2欧,灯A标有6V,6W,灯B标有4V,4W,求(1)若使灯B正常发光,R1应多大?(2)这时灯A的实际功率多大?(3)这时电源的输出功率多大?图是电源与R1串联在一起](/uploads/image/z/2156986-10-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8A%A8%E5%8A%BFE%3D10V%2C%E5%86%85%E9%98%BBr%3D1%E6%AC%A7%2C%E7%94%B5%E9%98%BBR2%3D2%E6%AC%A7%2C%E7%81%AFA%E6%A0%87%E6%9C%896V%2C6W%2C%E7%81%AFB%E6%A0%87%E6%9C%894V%2C4W%2C%E6%B1%82%EF%BC%881%EF%BC%89%E8%8B%A5%E4%BD%BF%E7%81%AFB%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89%2CR1%E5%BA%94%E5%A4%9A%E5%A4%A7%3F%EF%BC%882%EF%BC%89%E8%BF%99%E6%97%B6%E7%81%AFA%E7%9A%84%E5%AE%9E%E9%99%85%E5%8A%9F%E7%8E%87%E5%A4%9A%E5%A4%A7%3F%EF%BC%883%EF%BC%89%E8%BF%99%E6%97%B6%E7%94%B5%E6%BA%90%E7%9A%84%E8%BE%93%E5%87%BA%E5%8A%9F%E7%8E%87%E5%A4%9A%E5%A4%A7%3F%E5%9B%BE%E6%98%AF%E7%94%B5%E6%BA%90%E4%B8%8ER1%E4%B8%B2%E8%81%94%E5%9C%A8%E4%B8%80%E8%B5%B7)
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