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在远距离输电中，一般都采用高压输电。为什么要采用高压输电呢？这是因为在输送同样功率的情况下，采用高压输电比采用低压输电在导线上的电能损失小得多。高压输电示教板用灯泡代替导线的电阻，把平时不易看到的导线所消耗的功率表现出来，可以形象地说明采用高压输电能够减?
In long-distance transmission, high-voltage power transmission is generally used. Why use high voltage power transmission? This is because the use of high voltage power transmission is much less lossy than the use of low voltage power transmission on the wire in the same power transmission. The high-voltage transmission teaching board replaces the resistance of the wire with a light bulb, and expresses the power consumed by the wires that are not easily visible at ordinary times. It can be illustrated that the use of high-voltage power transmission can reduce the power consumption.