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.
Transistor NPN A transistor amplifies current and can be used with other components to make an amplifier or switching circuit. This symbol is for a bipolar junction transistor (BJT), the type you are most likely to use at first.
Galvanometer A very sensitive meter used to measure tiny currents, usually 1mA or less.
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