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

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

Quizplus · Accepted Answer

Ohm's law states that the current passing through a conductor is directly proportional to the voltage across the conductor, and the slope of the graph between voltage and current is constant. This means that the graph should be a straight line passing through the origin. Option II is the only straight line passing through the origin, indicating that the device obeys Ohm's law.

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