如图，是恒温箱的电路示意图，它的工作原理是：通电后，当恒温箱内的温度未达到导电温度计金属丝A所指的 如图所示的是恒温箱的简易电路图．其工作原理是，接通右侧工作电...
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读图分析可知，当水银柱上升到金属丝A所指示的温度时，电磁铁是产生磁性的；温度下降后，电磁铁电路是断开的．故答案为：产生，断开．
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