Question

Following are non-ohmic devices except
A. Diode
B. Semiconductor diode
C. Transistor
D. Incandescent lamp

Answer 1

In order to solve this question, firstly we will understand the concept of ohm’s law i.e. V = IR. Then we will study about the ohmic devices and non-ohmic devices to find the required answer.

Complete answer:
We know that due to Ohm's law “The current that flows in the conductor is directly proportional to the potential difference V (or voltage) that is applied across its ends, known that the temperature and physical conditions of the conductor should be the same.

Potential Difference $\propto$ current
Or $V \propto I$
Which means V = IR

Where V is the voltage in volts
R is resistance in ohm
I is the current in Ampere

The main applications of ohm’s law are-
1. To determine the voltage, resistance or current of an electric circuit.
2. Ohm’s law is used to maintain the desired voltage drop across the electronic components.
3. Ohm’s law is also used in Dc ammeter and other dc shunts to divert the current.

Ohm’s law describes the current flowing through a resistance when different electric potentials (voltage) are applied at each end of the resistance.
The devices which follow ohm’s law for all voltages across are known as ohmic devices.
Examples of Ohmic devices are incandescent light bulbs, wire, electric stove heating element , resistor etc.

The devices which do not follow ohm’s law for all voltages are known as non-ohmic devices.
Electric devices like music players, computers, telephones etc are not ohmic devices.
Therefore, we conclude that the diode, semiconductor diode and transistor are non-ohmic devices whereas incandescent lamps are an example of ohmic-devices.

So, the correct answer is “Option D”.

Note:
While solving this question, we should also know that we can use the ohm’s law often to find the voltage, current or resistances of the circuit. The law relates current, voltage and resistance by the equation V = IR.