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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.