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Question
A V-I 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.
Solution
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
`"R" = "v"/1 = 0.4/0.1 = 4Ω`
We can also conclude that nichrome wire has a constant value of the resistance as 4 Ω4 Ω.
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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