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.

Answer 1

The graph between V & I  is a straight line. So, we can conclude that the 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/I = 0.8/0.1 = 4Ω`

We can also conclude that nichrome wire has a constant value of the resistance as 4 ohm.

The circuit diagram corresponding to the above graph is as shown below.