Question

1 what is ohm's law? Explain how it is used to define the unit of resistance?

Answer 1

Answer:

Ohm's law gives a relationship between current (I) and potential difference (V). According to ohm's law : At constant temperature , the current flowing through a conductor is directly proportional to the potential difference across its ends.

If I is the current through a conductor and V is the p.d. across its ends , then according to the ohm's law :

I∝V

or , V∝I

or , V=RI

or R=IV

where , R is a constant called "resistance" of the conductor.

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.

May this help You,Mate