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Question

Consider the following statements. Which of the statements given is correct?


A

Ohm's law is applicable to semiconductors.

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B

Ohm's law is not applicable at very low and very high temperatures.

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C

Conductance is the reciprocal of resistance and is measured in siemens.

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D

Ohm's law is not applicable to electron tubes, discharge tubes, and electrolytes.

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Solution

The correct option is D

Ohm's law is not applicable to electron tubes, discharge tubes, and electrolytes.


Ohm's law:

Ohm's law asserts that if all physical conditions and temperatures are unchanged, this same voltage across such a conductor is precisely proportional to the current flowing through all of it.

Mathematically, ohm's law can be represented as:

V=IR

or,

I=VR

or,

R=VI

Here,

R is the resistance.

V is the voltage.

I is the current.

The circuit diagram is below:

Ohm's law states that the slope of a V-I graph is a straight line, as in the case of conductors. However, with semiconductors, the slope of the V-I graph is curving rather than straight, meaning that Ohm's rule does not apply.

Therefore, options B, C, and D are correct.


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