A student recorded the following data for a metal wire as the current through it was gradually increased:
Current I (A): 0.2, 0.4, 0.6, 0.8, 1.0, 1.2
Potential difference V (V): 1.0, 2.0, 3.0, 4.0, 5.2, 6.6
a. (a) Calculate the resistance at each set of readings.
b. (b) At approximately what current does the wire begin to deviate from Ohm’s law?
c. (c) Give one reason for this deviation.