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08/07/2021

Verification of Ohm's Law

 Apparatus

  • DC Voltage Source : 1.0 V to 10.0 V
  • Resistance 
  • DC voltmeter : Suitable range
  • DC ammeter : Suitable range
  • Multimeter

Circuit Diagram


ohm-law.png

Procedure

  • Switch on the main supply.
  • Set DC voltage at say 1.0 V , note down the reading of voltage and current.
  • Increase DC voltage in step by step from 1.0 V to 5.0 V and note down reading of voltage and current.

Observation table


Sr.No

Potential Difference across resistor ( V )

Current passes through resistor ( I )

Ratio of V to I

( V / I )

1

1.0

0.1

10

2

2.0

0.2

10

3

3.0

0.3

10

4

4.0

0.4

10

5

5.0

0.5

10

 

  • Observe the reading of voltage and current.
  • If the voltage increases, current increases linearly.
  • Calculate the ratio of V to I for each reading.
  • Draw a graph for V ( Y – axis ) and I ( X – axis ).

verification-of-ohm-law


Conclusion

  • The electric current passes through conductor is directly proportional to potential difference across it. 
  • The ratio of V to I remains constant considering temperature and other consider unaltered.

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