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如果要在楼梯上下用二只开关去控制一只电灯,并且要做到每只开关都能独立地开灯和关灯,只要使用二只普通的市售《双开关》(即单刀双掷开关)。打开这种开关的盖子,你就可以看到里面有三个接线柱(或三个螺钉),其中一个接线柱通过转轴与掷刀A相通,还有二个分别与独立触头相连通。图1作为双开关的示意图,图中《1》表示通过转轴与掷刀A相通的接线柱,《2》、《3》表示与独立触头相通的接线柱,图中表示《1》与《2》相通,若转轴转动一次(即拉线拉动一次),则改变成《1》与《3》相通。二只双开关控制一只电灯的线路,如果仅从电灯发光的原理去考虑,至少可
If you want to control a lamp with two switches up and down the stairs, and to enable each switch to turn on and off the lamp independently, just use two common commercially available “dual switches” (single-pole double-throw switches). ). Open the lid of this switch, and you can see there are three posts (or three screws), one of which is connected to thrower A through the hinge, and two of which are connected to the separate contacts. Fig. 1 is a schematic diagram of a double switch. In the figure, “1” indicates a terminal through which the rotary shaft and the thrower A communicate. “2” and “3” indicate terminals that communicate with the independent contacts. The figure shows “1” and “ 2 ”is connected, if the rotation of the shaft once (that is, pull the cable once), then change into “1” and “3” connected. Two double switches control the line of a lamp, if only from the principle of lighting the lamp, at least