Question

explain why ohms law is not a universal law ​

Answer 1

Explanation:-

Ohm's Law :-

According to ohm's law the potential difference applied across a conductor is directly proportional to the current flowing through the cross section of the conductor.

If the physical factors like temperature ,pressure and all physical factors remains constant.

Ohm's Law is not a universal law like newton gravitational law because it depends upon the physical factor of the conductor like temperature, pressure etc.

And even all appliances doesn't follow the ohm's law.

The appliances which follows the ohm's law can be divided in two types :-

• Ohmic resistance :- Those conductor which follows the ohm's law is known as ohmic conductor.

Ex:- Wire of manganese etc.

• Non - Ohmic resistance :- Those conductor which doesn't follow the ohm's law is known as non - Ohmic resistance.

Ex:- Diode bulb, Triode bulb etc.

Answer 2

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Ohm's law:- This law states that the current flowing through a conductor is directly proportional to the potential difference across the conductor.

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Why ohms law is not a universal law?

Reason—

✴ It is not an universal or fundamental law because non-ohmic conductors like semiconductors does not obeys the ohms law. Their graphs are curved.

✴Similar as newton gravitational law, ohm's law not a universal law as it is depends on the physical factor of the conductor like pressure, temperature.

✴ Ex—A vacuum tube is a non-linear circuit. Its conductance changes with temperature, its current and voltage graph is not a straight line which implies that vacuum tube does not obey Ohm's Law..

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