# 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

Magnetic Contact | 门磁

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.

Related: Contact, Reed, Switch, Switch.

 

一个能检测到持续能量流内的中断的开关，可以用在任何基本电子设备上。将开关上下两侧移动可以打开或者关闭电流。大多数的家庭安防设备，使用闭合电路更容易，这样任何闯入都能触发信号（不仅仅是门或者窗户）。

 

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