Question
A V-1 graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.
✓
Answer
The graph between V & I is a straight line. So we can conclude that Current flowing through the wire is directly proportional to the potential difference V across it. The resistance of the wire can be calculated as,$\text{R}=\frac{\text{V}}{\text{I}}$$=\frac{0.4}{0.1}=4\Omega$
We can also conclude that nichrome wire has a constant value of the resistance as $4\Omega.$ Nichrome wire follows ohm's law thus it behaves as an ohmic conductor. The circuit diagram corresponding to the above graph is as shown below.
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