Question

23.
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.
Potential difference (V)
0.6
0 0.1 0.2 0.3 0.4. 0.5
Current (A)​

Answer 1

Explanation:

The information that can be inferred from the given graph is that a nichrome wire is a resistor that follows Ohm's law.

Ohm's law states that

Electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it provided that the temperature remains constant

V = I x R;

Here the graph shows a linear relationship between voltage and current, where the resistance of wire is constant

Answer 2

Answer:

In the given graph, we see as the potential difference is increasing, the current is also increasing.

Let us check whether the increase in both the quantities is constant everytime.

Condition 1 :

V = 0.4

A = 0.1

Hence, V/I = 4

Condition 2 :

V = 0.8

A = 0.2

Hence, V/I = 4

Condition 3 :

V = 1.2

A = 0.3

Hence, V/I = 4

Condition 4 :

V = 1.6

A = 0.4

Hence, V/I = 4

Condition 5 :

V = 2.0

A = 0.5

Hence, V/I = 4

Hence, We can say that the resistor "Nichrome wire" follows ohm's law.

The circuit is in the attachment.

OHM'S LAW –

At constant temperature and pressure, potential difference is directly proportional to who is the current in the circuit.

Hence, V ∝ I

So, V = IR

R is called the resistance.