Internet research tells me, they are. My graph says they are Non-Ohmic Devices.

Question

Internet research tells me, they are. My graph says they are Non-Ohmic Devices.

I know that a diode, for instance, is an example of a Non-Ohmic Device because its graph is a curve. However, when I graphed some Voltages (y-axis) and Currents (x-axis) of a resistor, the result was a variation in slopes (which is also the resistance), meaning to say that the graph is not a straight line (even just by looking at the minute fluctuations). Despite that, is the resistor still considered Ohmic? The deviations are not as pronounced as it is in a diode's graph.

Explanation / Answer

Ohmic and Non-Ohmic Resistors An ohmic resistor is one in which the value of the resistor does not change over a fairly wide range of applied voltages and currents. A graph of voltage vs. current for an ohmic circuit is shown in Figure . Since the ratio of voltage to current is fixed, the resulting plot is linear, i.e., it is a straight line that follows the relationship y = mx +b(the point, slope, intercept formula for a straight line).

example: a wire, incandescent light bulb, electric stove heating element or a resistor

Non-ohmic resistors are also referred to as non-linear because a plot of voltage vs. current

for such a resistor will not be a straight line (Figure 5.). In this case a linear fit of the data

points obtained while measuring voltage and current won

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