二次绕组中还带有110，220V输出电压端子供操作机构作电源。
The secondary winding offering the 110,220V voltage is used for power supply to operation machine.
如果负载电阻被直接连接到伏特计的输入端子，通过继电器触点的电流会产生电压降，测得的电池电压将存在误差。
If the load resistor was connected directly across the voltmeter input terminals, the current through the relay contacts would cause a voltage drop and the measured cell voltage would be in error.
电容器从放电电路断开以后，电容器中保持剩余的电荷，从而在电容器的端子之间重新建立起电压。
After a capacitor is disconnected from a discharge circuit, a residual charge remains on the capacitor, so a voltage is re-established across the capacitor terminals.
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