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(上接2015年第11期第22页)第九讲电路工作原理图1所示的水车中,水泵抽水推动水车转动,而经过水车的水流总是流回到水泵中。水泵以压力的方式将能量传递给管道中的水流。加压水流动的速率单位为每min流出的gal量,而水龙头可以用于开启或者关闭水流。水流从高处落下将能量传递给水车。最终,释放能量的水流回到源头。在没有完整回路的电路中,电子将无法流动。零电压的回路通常称为地线或者零线,地线一般为地表或者其他可以替代的导体,或者可以为不带电的导线(图2)。
(Continued from 11th November 2015, p. 22) Ninth Chapter Circuit Working Principle In the waterwheel shown in Figure 1, the water pump pushes the waterwheel to rotate while the water that passes through the waterwheel always flows back to the water pump. Pumps deliver the energy to the water flow in the pipeline in a pressured manner. The rate of flow of pressurized water is in units of gal that exits per minute and the faucet can be used to turn the water flow on or off. The water falls from a height and transfers energy to the waterwheel. Eventually, the stream of energy is released back to its source. In circuits that do not have a complete circuit, the electrons will not flow. The zero-voltage loop is often referred to as a ground or neutral conductor. The ground wire is usually a ground or other alternative conductor or it can be an uncharged wire (Figure 2).