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    中频炉的冷却水管为什么不带电？ 中频炉是采用冷却水。其中水管中的水其实是导电的，只是中频炉的冷却水管一般比较长，而水的电阻率又很大，相当于经过了一个很大的电阻，电压降了许多，人比较感觉不到，好像没有电一样。这个跟测电笔是一样的道理：明明有电，里边的氖泡会亮，而手摸在测电笔的金属部分却没有感觉。 Why is the cooling water pipe of the induction melting furnace not electrified? The induction melting furnace uses cooling water. The water in the water pipe is actually conductive, but the cooling water pipe of the induction melting furnace is generally relatively long, and the resistivity of the water is very large, which is equivalent to passing a large resistance, and the voltage drops a lot, which is less noticeable. , As if there is no electricity. This is the same as the test pencil: if there is electricity, the neon bulb inside will light up, but there is no feeling when you touch the metal part of the test pencil.