Question

A V-I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labeled circuit diagram to obtain such a graph.

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Answer 1

V-I graph:

The nichrome cable's V-I graph exhibits a straight line. It signifies that the resistance of the wire stays unchanged while the current supply has been varied. That is an ohmic conductor because it follows the ohm's law.

Mathematically, ohm's law can be represented as:

$\mathrm{V}=\mathrm{IR}$

or,

$\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}$

Here,

R is the resistance.

V is the voltage.

I is the current.

The resistance of a wire will be:

$$\begin{gathered} \Rightarrow \mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}} \\ =\frac{0.4}{0.1} \\ =4\mathrm{\Omega } \end{gathered}$$

Thus, the circuit diagram for the given case is,

Therefore, because nichrome wire has a constant resistance of 4 but also obeys Ohm's law, it is classified as an ohmic conductor.