【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
图甲是用与焊接塑料水管的热熔器,其电路如图乙所示,加热电阻R1=66Ω 、R2=176Ω,S1是手动控制开关, S2是可随温度自动跳转的温控开关,R0是特殊限流电阻,热熔器加热时R0的电阻较大, LED指示灯发红光,保温时R0的电阻较小, LED指示灯发绿光,已知LED灯发光时两端电压保持不变.
(1)开关 S1 和 S2都闭合时,热熔器处于_____(选填“加热”或“保温”)状态; (2)开关 S1 闭合, S2断开时, R1的功率_____R2 的功率(选填“大于”、“等于”或“小于”); (3)发红光时 LED灯的电流_____发绿光时 LED灯的电流(选填“大于”、 “等于”或“小于”) ; (4)保温状态时加热电路的电功率为_____.
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