Electricity can flow only if there is a complete circuit from the battery through wires to components and back to the battery again.
Preset variable resistor A preset is operated with a small screwdriver or similar tool. It is designed to be set when the circuit is made and then left without further adjustment. Presets are cheaper than standard variable resistors so they are sometimes used in projects to reduce the cost.
Voltmeter Measures voltage. The proper name for voltage is potential difference but voltage is more widely used.
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.
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