Question

What is Ohm's law ? Write the expression of resistance? Define the unit of resistance.
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Answer 1

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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points, given that the physical conditions such as length of wire, temperature etc remains constant.

The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.

The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1.0 volt, applied to these points, produces in the conductor a current of 1.0 ampere the conductor not being the seat of any electromotive force.

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Answer 2

Answer:

Explanation:

Ohm's Law:

Ohm's law is defined as :

                    "The amount of current passing through a

                      conductor is directly proportional to the

                      potential difference applied across the

                      ends of the conductor providing the phy-

                      sical condition e.g., temperature remains

                      constant."

Mathematical Expression:

Mathematically:

V ∝ I

V=IR

R is the proportionality constant called as resistance.

Resistance is defined as:

          "The opposition to the flow of

             electrons in a conductor"

Unit of resistance:

As it is known:

V =IR

or

R = V/I

R = volts/Ampere

R = Ohm

Volts/ampere is called as Ohm which is a unit of resistance.

Definition of ohm:

It is defined as:

          The resistance of the conductor is one ohm

            when current flowing through the conductor

             is one ampere and potential difference applied

              is one volt.

HAVE A GREAT DAY MATE:)