Flag Electric Current> How we can select the resistance of the d...
question mark

How we can select the resistance of the driver cell and length of the wire for a potentiometer?

Pallab Sarma , 7 Years ago
Grade 12
anser 1 Answers
Arun

Last Activity: 7 Years ago

Potentiometer is a device used to measure the internal resistance of a cell, to compare the e.m.f. of two cells and potential difference across a resistor. It consists of a long wire of uniform cross sectional area and of 10 m in length. The material of wire should have a high resistivity and low temperature coefficient.  The wires are stretched parallel to each other on a wooden board. The wires are joined in series by using thick copper strips.
Potential gradient is given by,
( σ = V / L )
As length of the wire (L) is more, small will be the magnitude  of σ  and we  have more accuracy in measurement of potential difference with the help of potentiometer

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments