如图,电源两端的电压U=7.5v,且保持不变,R为保护电阻,L为标有“6v 3w”的小灯泡,不考虑灯丝电阻随温度的变化.电流表量程为0~0.6A,电压表量程为0~3v.闭合开关S后,要求灯L两端的电压不超过额定电
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![如图,电源两端的电压U=7.5v,且保持不变,R为保护电阻,L为标有“6v 3w”的小灯泡,不考虑灯丝电阻随温度的变化.电流表量程为0~0.6A,电压表量程为0~3v.闭合开关S后,要求灯L两端的电压不超过额定电](/uploads/image/z/4615963-43-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%94%B5%E6%BA%90%E4%B8%A4%E7%AB%AF%E7%9A%84%E7%94%B5%E5%8E%8BU%3D7.5v%2C%E4%B8%94%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98%2CR%E4%B8%BA%E4%BF%9D%E6%8A%A4%E7%94%B5%E9%98%BB%2CL%E4%B8%BA%E6%A0%87%E6%9C%89%E2%80%9C6v+3w%E2%80%9D%E7%9A%84%E5%B0%8F%E7%81%AF%E6%B3%A1%2C%E4%B8%8D%E8%80%83%E8%99%91%E7%81%AF%E4%B8%9D%E7%94%B5%E9%98%BB%E9%9A%8F%E6%B8%A9%E5%BA%A6%E7%9A%84%E5%8F%98%E5%8C%96.%E7%94%B5%E6%B5%81%E8%A1%A8%E9%87%8F%E7%A8%8B%E4%B8%BA0%7E0.6A%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E9%87%8F%E7%A8%8B%E4%B8%BA0%7E3v.%E9%97%AD%E5%90%88%E5%BC%80%E5%85%B3S%E5%90%8E%2C%E8%A6%81%E6%B1%82%E7%81%AFL%E4%B8%A4%E7%AB%AF%E7%9A%84%E7%94%B5%E5%8E%8B%E4%B8%8D%E8%B6%85%E8%BF%87%E9%A2%9D%E5%AE%9A%E7%94%B5)
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