Question

If you draw a graph between the potential difference and current flowing through a metallic conductor , what kind of curve will you get? Explain how would you use this graph to determine the resistance of the conductor.

Answer 1

When we draw a curve between potential difference and current through conductor then according to Ohm's law (Potential difference = current flowing x R) we can see that the equation is of the format : y = mx +c where m is the slope and c is the point on y-axis ,i.e, when x=0. Hence the graph is a straight line with m = R and c = 0. Here R is the resistance.

Answer 2

Ohm's law:

   The graph between the potential difference V and the current I flowing through a metallic conductor is a straight line curve. In the operating range of values, the relation between the voltage V and the current I is linear.

    V = I R 

 R = resistance of the metallic conductor.

R is obtained by finding the slope of the graph.  

  R = (V2 - V1)/(I2- I1)