Assume V to be the voltage produced by the cell in the primary circuit across the length AJ of the potentiometer wire, and E to be that produced by the cell of the secondary circuit.

What does a potentiometer do to current?

Rheostats are used to control the amount of current by varying its resistance. ... Potentiometers, trimmers, and rheostats are all variable resistors. Potentiometers and trimmers are used to create a variable voltage by varying the voltage between their wiper terminal and two ends.

Why does potentiometer not draw current?

Potentiometer is based on no deflection method. When the potentiometer gives zero deflection, it does not draw any current from the cell or the circuit i.e. potentiometer is effectively an ideal instrument of infinite resistance for measuring the potential difference.