states that current is proportional to voltage, at constant temperature, . (d)
The graph should be a straight line passing through the origin.
For non-ohmic conductors current is not proportional to voltage, . The graph is non-linear. Examples of non-Ohmic conductors include
as gradient is not constant, or, as gradient is not constant.
Typical graphs can be
y-axis: I, x-axis: V, gradient decreases;
y-axis: V, x-axis: I, gradient increases.
NTC (negative temperaure coefficient): ;
PTC (positive temperature coefficent): .
- Light dependent resistors (LDRs)
brightness , ;
a variation in strain of a material (deformation per unit length due to the effect of an applied load/mass) produces a variation in electrical resistance of material