PHYSICS PRACTICAL PROCEDURE


             Physics practical procedure for class 12 students to do the practical.

LINEAR RESISTANCE OF A GIVEN WIRE

 AIM:  To determine resistance per cm i.e linear resistance of a given wire by plotting a graph of potential difference versus current.
APPARATUS:  A resistance wire, a voltmeter, an ammeter, a battery, a rheostat, a meter scale, a one-way key, and connecting wire.
FORMULA: 
            The resistance of given wire   R = V/i   ohm
            Where V – Voltage applied in volt  and i – Current through the wire in ampere
      Linear resistance of given wire    σ = R/l


GRAPH:
Graph between potential vs current


TABULAR FORM FOR UNKNOWN RESISTANCE:


S.No
The voltage across the wire
           V in volt
Current through the wire
              I   in amp
Resistance
       R = V/I     in ohm
  1

  2

  3

  4

  5

  6




RESULT:
The graph between V and i is a straight line and linear resistace of the wire 
           σ = _______ohm/cm.


    COMPARING THE EMFs OF TWO GIVEN PRIMARY CELLS

AIM: To compare the EMFs of two given primary cells using a potentiometer.
APPARATUS:  Potentiometer, battery, two cells ( a Leclanch cell and a Daniel cell), rheostat, resistance box, a one-way key, a two-way key, a jockey, and connecting wires.
FORMULA:
                                               E1/E2 = l1/ l2

Where E1 and E2 are EMFs of the two given cells and l1 and l2 are corresponding balancing lengths on potentiometer wires.
CIRCUIT:
Potentio meter comparing emf of two cells


TABULAR FORM:

S.No.

Current
      I    in amp
Balancing point (length) in cm

For E1

For E2

E1/E2 = l1/ l2






RESULT:  
            EMFs of two cells are compared.

                         The ratio of EMFs of given cells    E1/E2 = l1/ l2 =












Comments

Popular posts from this blog

Hydrogen is in abundance around the sun

Questions on Electric charges and fields