A student investigated the relationship between potential difference across a nichrome wire and the current through it. The readings she recorded are given below:
Potential difference V (in volt): 1.0, 2.0, 3.0, 4.0, 5.0
Current I (in ampere): 0.20, 0.40, 0.59, 0.80, 1.00
Answer the following with the help of these observations.
(a) Calculate the resistance of the wire for each individual reading.
(b) On a sheet of graph paper draw a graph of V (y-axis) against I (x-axis) for the above data and draw the best straight line passing through the origin.
(c) Determine the average value of resistance from your calculations in part (a).
(d) State, with one supporting reason based on both your graph and calculations, whether the wire obeys Ohm’s law in the given range of readings.