Which of following is an example of non-ohmic resistance:
- Aluminium wire
- Copper wire
- Carbon resistance
- Tungsten wire
Correct answer: 3. Carbon resistance
Explanation: Carbon resistors are examples of non-ohmic resistors. The resistance in a carbon resistor is not constant and can change with the applied voltage or current. The resistance of a carbon resistor may vary due to factors like temperature and aging, making it a non-ohmic device.