Relay An electrically operated switch, for example a 9V battery circuit connected to the coil can switch an AC mains circuit. The rectangle represents the coil. NO = Normally Open, COM = Common, NC = Normally Closed.
Thermistor A transducer which converts temperature (heat) to resistance (an electrical property).
A rheostat has 2 contacts and is usually used to control current. Uses include controlling lamp brightness or motor speed and changing the rate of flow of charge into a capacitor in a timing circuit.
An EX-OR gate can only have two inputs. The output of an EX-OR gate is true when its inputs are different (one true, one false).
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