以试电笔接近刚脱下来的羊毛衣，试电笔的氖管(neon tube )就发光 电饭锅的原理 电饭锅是利用发热板，在铝质锅的底部煮饭。发热板内藏电热线，这电热线是由自动 开关控制。
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如果再串联一个氖管则在夜间亦能方便地判断开关的通断状态，同时还可判明电路中是否有电。
If a neon tube is connected with the utility model in series, the on-off state can be conveniently judged at night, and simultaneously, the existence of an electricity can be judged in the circuit.
在对配电变压器冲击试验方法的研究基础上，提出在电站现场进行试验可以用氖管指示器代替示波器，使试验方法简化，故障判断直观、可信。
The work principle of the viscous fluid damper under shock load is analyzed and the damping expression is derived, the parameters of which are determined using shock tests.
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