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Switches are used to make or break a circuit. Here are some common varieties and their names.
The diagram shows single and double pole switches.
Using two SPDT switches, draw a diagram to show how stair lights work. It should be possible to turn the light on or off both at the top and bottom of the stairs.
These come in two varieties: push-to-make (NO) and push-to-break (NC).
When a switch is closed, the contacts often bounce causing the circuit to be closed and opened several times until the bouncing has stopped. For something like a lamp or hoover, this does not matter at all but in circuits that count or rely on pulses, switch bounce can stop the circuit working properly.
The switch needs to be de-bounced and this circuit can be used ...
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