Loudspeaker A transducer which converts electrical energy to sound.
An AND gate can have two or more inputs. The output of an AND gate is true when all its inputs are true.
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.
Ammeter Measures current.
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