Switches

media type="custom" key="2690023" toc = Switches and Sensors = Identification, function and application of the following input components used in the production of electronic products:
 * light dependant resistors (LDR)
 * thermistor
 * moisture sensor
 * piezo electric sensor
 * biosensors (conversion of a biological response to an electrical signal)
 * toggle
 * slide
 * rocker
 * key
 * push to make
 * push to break
 * tilt
 * reed

There are many different types of switches and they play a very important part in electronics. Computers for example, use electronic switches of various kinds, and the fact that computers can be used to control aeroplanes and robots is a result of their ability to switch thing on and off. = On/Off Switch = The simplest switch is an on/off switch the circuit symbol is given below: We know that a current will not flow in a circuit which has a gap in it: when the switch is open, there is a ap, but when it is closed the circuit is completed and current flows. We can use switches to direct current around a circuit, by rerouting or breaking connections that make up the circuit. = Terminology = = = = Task = Complete the following worksheet = = = Students Work = media type="custom" key="6893427" = Extra Switches =
 * **//Poles//** || The moving part of a switch ||
 * **//Throws//** || The part where the **//'pole'//** comes to rest ||
 * **//Common//** || The actual connection of the switch ||
 * **//Normally open//** || The pole is resting on a throw in an open position, no current is flowing until the pole is moved. ||
 * **//Normally closed//** || The pole is resting on a throw in a closed position, therefore a current is flowing until the pole is moved. ||

Relays
A relay is an electromechanical device which uses a small current to switch much larger load current. For more infor check out http://en.wikipedia.org/wiki/Relay
 * The control current is isolated from the load current.
 * Relays are used in switching circuits where the output of that circuit has insufficient power to drive the output device.

Input Transducer
Another term for a switch, but use the link to find out more about input transducers

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