The example of non-ohmic resistance isA) DiodeB) Copper wireC) Filament lampD) Carbon resistor

The correct answer is C) Filament lamp.

A non-ohmic resistance refers to a component or material whose resistance does not remain constant with changes in applied voltage or current. Instead, the resistance varies based on the magnitude and direction of the current flowing through it.

In the given options, the filament lamp is a clear example of a non-ohmic resistance. When a filament lamp is connected to a power supply and current flows through it, the resistance of the filament increases as the current increases. This is due to the lamp's characteristic of producing light through the heating of its filament, which causes an increase in resistance with temperature. As a result, the current-voltage relationship is nonlinear for a filament lamp, making it a non-ohmic device.

On the other hand, options A) Diode, B) Copper wire, and D) Carbon resistor are examples of ohmic resistances. Ohmic resistances, also known as linear resistances, have a constant resistance value over a wide range of voltages and currents. The relationship between voltage and current for an ohmic resistor is linear and follows Ohm's Law.