A trembler switch operates by vibrations. Vibrations cause the switch mechanism to complete or interrupt an electrical circuit. It can be used to trigger and alarm, turn on lights or many other devices. A simple trembler uses a metal can (soup can) with a small hole in the top and a weight suspended from a bare wire through the hole with a weight attached to the end of the wire (the hole must be large enough so the wire does not make contact with the can). The other end of the wire is connected to a battery (or other power source). The other pole of the battery is connected to the can. When vibrations cause the weight to move enough to cause the bare wire going through the hole in the top of the can to contact the can the circuit is completed.
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A normally closed switch is a switch that is normally closed. When you operate it, it opens.
Push-To-Make switch is a switch in which pressure is applied to the switch for it to let the electricl current flow through.
When the neutral wire goes to the switch
To control a light with a switch, the switch has to be connected in series with the light fixture.
voltage is measured by voltagd drops. When a switch is open/ off there is a voltage difference between one side to the other. when the switch is on there is no drop from one side of the switch to the other. That is normal operation. If switch is on, and you get a voltage reading across the switch, the switch is bad.