Pattern: Analysis of Ohm's Law
Description: Ohm's Law is primary to all the recurring concepts in electricity. The electrical nature of a circuit element can be determined by its V-I graph. Basic problems related to voltage and current dependence of a wire are common in short answer questions. Comparison of resistances by comparing their V-I characteristics also forms an interesting pattern of questions that you should look out for in the exam.
How to approach:
According to Ohm's Law, voltage is directly proportional to the current flowing through a circuit, provided temperature remains the same. So the V-I characteristics of resistance should be a straight line and not otherwise.
The slope of the V-I graph gives the resistance of a circuit. Higher the slope, the higher is the resistance.
Show questions to practice