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

Question

Internet research tells me, they are. My graph says that 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.

The graph is linear, except at the point: (72.5 and 7.23)

So my resistor still considered Ohmic, or Non-Ohmic? Also, do I use (R=Delta V/Delta I) to solve for the Resistance or R=V/I?

Explanation / Answer

listen there can be other factors due to which the graph didnt come straight....it depends mainly on the type of resistor you are using...resistors do heat up after passing current for a long time and this causes there graph to deviate from a straight line...but resistors are ohmic devices ...

now what you do in this case is that try to take these reading again with a new resistor of the same type and note the readings again...if not possible then take these readings and use R=V/I as your relation...(you can make some little modifications in the readings to make it a straight line)

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