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.
LDR A transducer which converts brightness (light) to resistance (an electrical property). LDR = Light Dependent Resistor
Galvanometer A very sensitive meter used to measure tiny currents, usually 1mA or less.
A capacitor stores electric charge. It can be used with a resistor in a timing circuit, for smoothing a supply (it provides a reservoir of charge) and can be used as a filter (blocking DC signals but passing AC signals). Unpolarised capacitors usually have small values, less than 1µF.
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