## To determine resistance per cm of a given wire by plotting a graph for potential difference versus current

How to determine resistance per cm of a given wire by plotting a graph for potential difference versus current.

Write from below for your practical record.

### CONCLUSION

Resistance per cm of the wire is found to be **0.424 Ohm/cm**.

The graph between potential(V) versus current(I) is a straight line and from the graph is found to be **______ Ohm**.

**—:: All The Best ::—**

## PRACTICAL EXAM – 2024

### AIM OF THE EXPERIMENT

To determine the resistance per cm of a given wire by plotting a graph of potential difference versus current.

### APPARATUS REQUIRED

- A Voltmeter
- An Ammeter
- A Rheostat
- A Battery (Battery Elliminator)
- A Resistance Wire
- Connecting Wires
- A Meter Scale
- Connecting Wires

### THEORY

Ohm’s law states that the current flowing through a conductor is directly proportional to the potential difference between the two ends of the conductor provided the physical conditions remain the same.

i. e. I \propto V

or V \propto I

\implies V = IR \implies R = \frac{V}{I}### PROBLEM

A wire of length “L” is stretched to double its length. Compare the resistances of the original and stretched wire.

Kajal Kalta says

Thank you sir

Raaz Sir says

Most welcome my dear student.

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