Question

what is ohm low and why it is use ful​

Answer 1

Answer:

The potential difference, across the end of a given metallic wire in an electric circuit is directly proportional to the curve flowing through it, provided its temperature remains same. This is called Ohm's law.

Answer 2

Explanation:

Ohm's law states that resistance R is inversely proportional to current I ie.

R α 1/I [ here see that the sign is used is proportional. It is not to be confused with alpha]

=> R = ρ/I

=> ρ = RI where ρ is the proportionality constant called electrical resistivity of the substance.

It is useful because it tells us about the resistivity of the given material.

Hope it helps...........