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A V-I graph for a nichrome wire is given...

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.

Text Solution

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Graph between V and I is a straight line . So, this infers that the flow of current (I) in the conductor is directly proportional to the potential diffidence (V) established across it . This is ohm.s law
Resistance of the wire can be calculated as
`R = (V)/(I) = (0.8)/(-0.2)` = 4 ohm
This means nichrome wire has a constant value of the resistance 4 ohm
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