Question

State in brief the meaning of a variable resistor. Draw a circuit diagram to illustrate it's function specially in the study of variations in current with the potential difference across a resistor.

Answer 1

An electronic component that is used to vary the amount of current that flows through a circuit. It works by sliding a wiper terminal across a resistive material, typically a thin film or chunk of carbon or a resistive wire made of nickel chromium or tungsten alloys.

Answer 2

A device to regulate current without changing the voltage source in an electric circuit is called a variable resistor or a rheostat.