Electrical Engineering ⇒ Topic : Non-ohmic Conductors

Non-ohmic Conductors

Those conductors which do not obey Ohm 's law (I α V  ) are called non-ohmic conductors e.g.,vacuum tubes, transistors, electrolytes, etc. A non-ohmic conductor may have one or more of the following properties

(1) The V-I graph is non-linear i.e. r /1 is variable.

(2) The  graph may not pass through the origin as in case of an ohmic conductor.

(3) A non-ohmic conductor may conduct poorly or not at all when the p.d. is reversed.

The non-linear circuit problems are generally solved by graphical methods.

                                                                          FIGURE (A)

Fig. (A) illustrates the graphs of non-ohmic conductors. Note that  V-I graphs for these nonohmic conductors are not a straight line