Question

what is ohm law?explain how it is used to define the unit resistance ​

Answer 1

Answer:

Ohm's Law states that electric current flowing in a conductor is directly proportional to potential difference across the ends of the conductor,provided temperature and other physical conditions remains constant.

The unit of resistance is ohm. If V=1 volt and I=1amp , then R=11=1ohm. Thus , 1 ohm is the resistance of a conductor such that when a potential difference of 1 volt is applied to its ends , a current of 1 amp flows through it.

hope it helps you

Answer 2

According to ohm's law; the flow of current is directly proportional to the potential difference applied at its ends provided that temperature and physical conditions are constant.

So V is directly proportional to I or V=IR.

Where R is constant of proportionality when CH is called resistance.

Unit of V is volt (V) and that of current is Ampere (A)

Hence from relation V=IR, R=V/I.

So unit of R is V/A, which is called ohm