Question

Choose the ohmic conductor from the below-given options.

• A. Transistor
• B. Vacuum tube
• C. Electrolyte
• D. Nichrome wire

Answer 1

The correct option is D

Nichrome wire

Step 1: Explanation of the correct option

In the case of option D,

1. An ohmic conductor is one that obeys Ohm's Law, which states that the potential difference between the two ends of a resistor is directly proportional to the current flowing through it.
2. The resistance of nichrome wire does not change when current and voltage change. As a result, it is classified as an ohmic conductor.

Step 2: Explanation for the incorrect options

In the case of option A,

1. A transistor is a semiconductor device that can conduct as well as insulate electric current or voltage.
2. Transistors do not follow Ohm's law, so they are not ohmic conductors.

In the case of option C,

1. There are no charged particles in vacuum tubes, hence they cannot conduct electricity.
2. Vacuum tubes do not have a linear circuit.
3. Its conductance varies with temperature, and the graph of current and voltage is not a straight line, implying that the vacuum tube violates Ohm's law. So it is not an ohmic conductor.

In the case of option C,

1. An electrolyte is a medium that contains ions and conducts electricity through the movement of ions but not electrons.
2. An electrolyte can be an ohmic conductor and a non-ohmic conductor

Hence, option D is the correct answer.