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

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 ).

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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