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  GCSE    Switches  0 of 23    Question 260    Components 
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Deadline not set1 of 23    Question 700    Motors 
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Deadline not set10 of 23    Question 265    Switch Types 
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Deadline not set11 of 23    Question 273    Switch Types 
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Deadline not set12 of 23    Question 272    Switch Types 
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Deadline not set13 of 23    Question 274    Switches 
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Deadline not set23 of 23    Question 1395    Switches 
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Deadline not set  Questions 0 to 23   -->  View All  

A switch is a passive digital input transducer with a resistance or zero (on) or infinity (off) Ohms.

High Voltage Switch

 

Switch Properties

Switches are used to make or break a circuit. Here are some common varieties and their names.

Circuit Diagram Symbols

The diagram shows single and double pole switches.

Switch Types

Puzzle

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.

Push Button Switch

These come in two varieties: push-to-make (NO) and push-to-break (NC).

Push Button Switch - Push to Make

Switch Bounce

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 vacuum cleaner, this does not matter at all. In circuits that count pulses, switch bounce can stop the circuit working properly.

The switch needs to be de-bounced and this circuit can be used ...

Switch Debounce using an RF Flip Flop

More Debouncing Circuits

Three Switch Debounce Circuits

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