Question

0.6.Write Ohm's law ? What are its limitation ?​

Answer 1

Answer:

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points

Explanation:

The law is not applicable to unilateral networks.

Answer 2

Explanation:

Limitations of Ohm’s Law

Although Ohm’s law is an important principle in the field of electronics, it cannot be considered as an actual physical law. We know that as per ohm’s law voltage / current = a constant and that constant is the resistance. But the resistance does not remain constant all the time. When the current passes through a material, it heats up. When the temperature of the material changes, the resistance changes. So when the resistance changes, and we divide the voltage across the resistor by the current passing through it, we will not get the same numbers always.

Ohm’s law is applicable and valid for many materials. But there are some materials that do not support the ohm’s law. Some materials and devices which are used in electric circuits do not have the proportionality between voltage and current. For Example, consider a diode and plot a graph between voltage and current. When the value of voltage is marked in the reverse direction by keeping the magnitude fixed, it produces the current with different magnitude in the opposite direction. The relationship between the voltage and current is not linear.