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Typical Wiring Diagram For Central Heating
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Loudspeaker A transducer which converts electrical energy to sound.
Voltmeter Measures voltage. The proper name for voltage is potential difference but voltage is more widely used.
Diode A device which allows current to flow in only one direction.
A potentiometer has 3 contacts and is usually used to control voltage. It can be used like this as a transducer converting position (angle of the control spindle) to an electrical signal.