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CBSE Class 10 Science Question 7 of 41

Electricity — Question 7

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Question 7

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below –

I (ampere)0.51.02.03.04.0
V (volts)1.63.46.710.213.2

Plot a graph between V and I and calculate the resistance of that resistor.

Answer

The graph is plotted as below:

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below. Plot a graph between V and I and calculate the resistance of that resistor. NCERT Class 10 Science CBSE Solutions.

The slope of the line indicates the value of resistance.

Let P1(3.4, 1) and P2(10.2, 3) be two points on the graph

Slope = 1R=3−110.2−3.4=26.8\dfrac{1}{\text{R}} = \dfrac{3-1}{10.2-3.4} = \dfrac{2}{6.8}

R = 6.82\dfrac{6.8}{2} = 3.4 Ω

Therefore, the resistance = 3.4 Ω.