CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 27(b)

Electricity 2 marks Easy

In the experiment of studying the dependence of potential difference (

V

) across a resistor on the current (

I

) passing through it a student has tabulated a set of six observations. If, now he draws a graph between

V

and

I

, what will be the shape of the graph and what conclusion can be drawn from it ?

Answer

The $V$ – $I$ graph is a straight line through the origin, so $V$ is directly proportional to $I$ (Ohm's law).

Shape: the graph between

V

and

I

is a straight line passing through the origin. Conclusion: the potential difference across the resistor is directly proportional to the current through it,

V \propto I

, so

\frac{V}{I}

is constant; this constant is the resistance

R

of the resistor (the slope of the

V

I

graph), and the result is Ohm's law,

V = I R

, at constant temperature.

🔒 Step-by-step solution

From the board paper

CBSE Class 10 Science 2018 · Paper 31(B)/C, Question 27(b) — all 27 questions with answers →

CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 27(b)

Answer

From the board paper

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