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State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
Ohm's law states that at a , the flowing through a conductor is directly proportional to the between the two ends of the conductor.
Mathematically, it is written as .
Experimental verification:
1. Connect the cell, , ammeter and key in , and the voltmeter to the circuit.
2. First, in the circuit and note the value in the ammeter and the in the voltmeter.
3. Now, connect in the circuit and note the values.
4. Again, connect in the circuit and note the values again.
5. Repeat the same steps using in the circuit and tabulate the values in a table.
Graphical representation:
It is observed that the values of \(\frac {V}{I}\) are the . The graph between the potential difference (\(V\)) and the current (\(I\)) is a . The line proves that \(\frac {V}{I}\) is a .
The graph shows that as the current through a metallic wire , the potential difference across the wire also .
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