current electricity
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35 Terms
def electricity and electric current
The type of energy due to the flow of electric charges is called as electricity
the flow of charge through a conductor is called as electric current
direction of current
def EMF
Electromotive force of a source can be defined as the work done by the source in moving a unit positive charge from lower potential to the higher potential
EMF is maximum potential unit of a circuit
E=W/Q
Def OHM’S Law
def resistance
what are the factors affecting resistance
TEMPERATURE directly propotional
SI unit ohm for resistivity it is ohm metre
Classification of materials in terms of resistivity
temperature dependance of resistivity for conductors
def current density and SI unit
current density is the amount of current flowing per unit cross sectional area
current density when area not in direction to current
Conductance and conductivity
Conductance- inverse of resistance
conductivity- inverse of resistivity
mechanism of current flow in a conductor: DRIFT VELOCITY AND RELAXATION TIME
Drift velocity derivation
relation btw drift velocity and current
deduction of OHM’S law (V.IMP)
Mobility of charge carriers
relation between electric current and mobility for a conductor
types of conductors OHM’s law holds true and not
Superconductivity
Meissener effect
TC-- Critical temp
Resistance in series
Resistance in parallel
Heating effect of current
Applications of heating of current
Electric power
proof of heating effect of current
commercal unit of electric energy
Kirchhoff’s 1st law
based on law of conservation of charge
Kirchhoff’s 2nd law
based on law of conservation of energy
Wheatstone bridge (imp derivation)
inbetween the current does not flow because both the junctions have the same potential
relation between EMF and internal resistance of a cell (imp)
cell in series
cell in parallel
define temperature coefficient of resistance of metal
it is the fractional change in resistance of a metal corresponding to a temperature change of 1degree
the ratio of current density and electric field is called
conductivity