What is Ohm’s law

Georg Simon Ohm

  • Ohm’s Law states that at a constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends.
  • Law states that                                    I∝V (at constant temperature)
    this can also be written as                 V∝I   

                                           Or                           V=R×I

                                                                           V=Potential differnce
                                                                        R=Resistance  (which is a constant)
ohm’s law is represented by a graph:-

Here question arises what is a Resistance. So,


What is Resistance

  • Electrical Resistance is the quantity that determines how much difficulty current faces while flowing through a conductor.
  • The Resistance of a conductor depends on the length, thickness, nature of material, and temperature of the conductor.
  • It is the measure of voltage divided by current or voltage/current(V/I)
  • It is represented by R.
  • It’s SI unit is ‘0hm’ and with symbol Omega (Ω).
  • 1 0hm=1 volt/1 ampere

let’s do a question on resistance:-
The potential difference between two points of a wire carrying a 2 amperes current is 0.1 volt. calculate the resistance between these points? 

from ohm’s law we have:
Potential difference/Current=Resistance
Here, Potential difference,V=0.1 Volt
            Current,I=2 Amperes
putting these values in the above formula, we get:
or               Resistance,R=0.05 ohm        or (0.05 Ω).

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