A Complete Collection of 100000 Whys
Fav十万个为什么
为什么热水壶烧开自动断电？
简单的摘要：热水壶烧开自动断电的原因主要是蒸汽感应装置、双金属片温度控制器以及磁钢限温器共同作用的结果。
1、热水壶内部装有蒸汽感应装置，当水烧开后产生蒸汽，蒸汽感应装置会触发电路断开，从而停止加热。
2、双金属片温度控制器在温度达到设定值时，由于两种金属膨胀系数不同，双金属片会发生形变，断开电路，实现自动断电。
3、磁钢限温器通过磁钢与感温磁钢的吸合和释放来控制电路通断，当水温达到沸点时，感温磁钢失去磁性，磁钢限温器释放，切断电源。
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