# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Contact | 触点

A switch detects an interruption in the continuous flow of energy, just as it does in any basic electrical device. Throwing the switch up or down or side to side can either open or close that circuit depending on your goals. For most home security devices, it's much easier to use a closed circuit, so that break-ins (and not door or window closings) trigger the signal.

一个能探测到持续能量流中断的开关。将这个开关向上或向下打开关上或者放到一边能开或者闭合一个电路。对于大部分住家报警设备，使用闭合电路更加容易，这样任何闯入都能触发警报（例如没关窗或者没关门）


Letter Selection	Email Enquiry
选择词条	邮件咨询