Ohm’s law states that the voltage drop V across an ideal resistor is linearly proportional to the current i flowing through the resister as in V = iR , where R is the resistance. However, real resistors may not always obey Ohm’s law. Suppose that you performed some very precise experiments to measure the voltage drop and corresponding current for a resistor. The following results suggest a curvilinear relationship rather than the straight line represented by Ohm’s law: