POTENTIOMETER EXPERIMENT- K12 CBSE PHYSICS #2

POTENTIOMETER EXPERIMENT- INTERNAL RESISTANCE OF A PRIMARY CELL

CIRCUIT DIAGRAM :

AB-     Potentiometer

Rh-Rheostat

L  - Lechlanche cell

H.R-High resistance

G- Galvanometer

R-Known Resistance

J- Pencil Jockey positions

Bt -Battery Eliminator (3 amps.)

K- Plug keys

SIMPLE CIRCUIT DIAGRAM

EXPERIMENTAL SET UP

FORMULA

TABULAR COLUMN & OBSERVATION:

PROCEDURE:

•    The circuit connections and the experimental set up are made as shown in the previous page.
•      In the open circuit,when resistance is not included, the emf of the cell is deterimned by noting the balncing length.  
•     In the closed circuit, when the resistance is included the balncing length is to be noted.   
•    The experiment is repeated for different  values  of R and the readings are tabulated. 
•    Using the formula the internal resistance of the given cell can be calculated.
• RESULT:

              The internal resistance of the given  

            primary cell (Lechlanche cell)  = 7.16 Ohms