Electricity Free Lesson for Class 10 Science NCERT

7 Topics | 2 Quizzes
Light – Reflection and Refraction

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**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**

** R=V/I**

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

**Here question arises what is a Resistance. So,**

**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? **

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

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