Which of the following graphs best represents the current-voltage relationship for a device that obeys Ohm's law?
A) I
B) II
C) III
D) IV
E) V

Question

Which of the following graphs best represents the current-voltage relationship for a device that obeys Ohm's law? 
A) I 
B) II 
C) III 
D) IV 
E) V

Quizplus · Accepted Answer

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. This means that the current-voltage relationship should be a straight line passing through the origin. Graph II is the only graph that shows a linear relationship between current and voltage, therefore, it best represents the current-voltage relationship for a device that obeys Ohm's law.

Which of the Following Graphs Best Represents the Current-Voltage Relationship