A student recorded the following data for a metal wire as the current through it was…
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
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) Calculate the resistance at each set of readings.
(b) At approximately what current does the wire begin to deviate from Ohm’s law?
(c) Give one reason for this deviation.