CBSE Class 12th Chapter 3 Current Electricity pdf Download
Class 12 Notes Ch 3 Revision Notes
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Current Electricity Class 12 Notes Chapter 3
Read or Download - Class 12 physics Chapter 3 Current Electricity pdf
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CBSE Class 12 Physics Ch 3 Notes Current Electricity Notes
Electric Current: Pate of flow of electric charge through a Conductor is Called electric Current.
It is measured as the amount of electric charge passing through any cross-section of conductor in unit time. Denoted by I.
I = It if electric Current ductor is steady. 1= it is not steady.
SI Unit of Ampere (A). Current
Define ONE Regen through its Done Coulomb of charge flows cross-section in one any second-
I= 1C =
1 Ampere IA
Movement of Free Electrons in a Conductor At any temperature, electrons in a metal move randomly in all direction Like Coel Gas Particles.
fig shows an electron moving from A to B through repeated collision & straight Lines travel. between inclusion.
This Speed is Called Thermal velocity of free electrons Avenage Thermal velocity of free electrons in any direction remain zelo. Maug 20
DRIFT VELOCITY of FREE ELECTRONS
When a potential difference is applied across the ends of a Conductor the free electron it move with an average velocity opposite to the direction
of applied electric field, which is, Called Drift velocity of free electrons. Note: Order of Drift velocity. - 10 mls
r_{1} = r_{2}
Freid Relaxation Time: An time between two successive Collision (Collision of e with Ions) is Called Relaxation It is denoted by t
Let us consider a conductor of Length I and Area of tion A across which a potential Difference V Cross is applied.
Total No of free electron in Conductor is k
N = number density Volume of Conductor Ag(62)
N= nAL
force on the electrons acceleration of the electron
Thus drift velocity in teams of relaxation time. =0 Aug Thermal velocity V
Relation between Current & Drift Velocity from figure (C) Total No of electrons in a Conductor is N MAL
Time in which an election move from P to Quail N free electrons pass through cross sect =| t = l
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