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Uses of a potentiometer

What is the use of a potentiometer and could you explain its working (as level physics)

 

Asked Zoha

Answer:

The potentiometer is mainly used for,

  • To compare the emfs of two primary cells
  • To determine the internal resistance of a primary cell
  • To determine the value of a high resistance
  • To determine the emf of a cell.

pmThe details can be found here in NCERT Text book

 

Conversion of Galvanometer to Ammeter problem

Diagram of D'Arsonval/Weston type galvanometer.
Diagram of D'Arsonval/Weston type galvanometer. (Photo credit: Wikipedia)

A galvanometer can be converted to ammeter by connecting a low resistance, called shunt in parallel with it. If a galvanometer of resistance 45 Ω is shunted by a resistance of 5 Ω what fraction of main current passes through the  Galvanometer? What is the current which flows through the shunt?

 

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