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A NAND gate can have two or more inputs. The o on the output means not showing that it is a Not AND gate. The output of a NAND gate is true unless all its inputs are true.
Loudspeaker A transducer which converts electrical energy to sound.
LDR A transducer which converts brightness (light) to resistance (an electrical property). LDR = Light Dependent Resistor
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.