Current Electricity
,Due to circular motion of a charge
Current produced by motion of uniformly charged thin sheet
Current produced by motion of uniformly charged volume charge
, In a conductor, valence band
and conduction band overlap
each other as shown in figure.
Therefore, there is no forbidden
gap in a conductor
Metals such as copper, silver,
iron, aluminum etc . are good
conductors of electri city.
The forbidden gap between the valence band
and con duction band is very large in
insulators. The energy gap of insulator is
greater th an 3 electron volts (eV).
Rubber, wood, diamond, plastic
are some examples of insulators.
In semiconductors, the forbidden gap
between valence band and conduction
band is very small. It has a forbidden
gap of about 1 electron volt (eV).
Silicon, germanium and graphite a re
some examples of semiconductors.
, Behaviour of conductor in the absence of potential difference
The small dots represent the free
electrons and the red arrows
represent the random thermal
motion of the electrons
,Due to circular motion of a charge
Current produced by motion of uniformly charged thin sheet
Current produced by motion of uniformly charged volume charge
, In a conductor, valence band
and conduction band overlap
each other as shown in figure.
Therefore, there is no forbidden
gap in a conductor
Metals such as copper, silver,
iron, aluminum etc . are good
conductors of electri city.
The forbidden gap between the valence band
and con duction band is very large in
insulators. The energy gap of insulator is
greater th an 3 electron volts (eV).
Rubber, wood, diamond, plastic
are some examples of insulators.
In semiconductors, the forbidden gap
between valence band and conduction
band is very small. It has a forbidden
gap of about 1 electron volt (eV).
Silicon, germanium and graphite a re
some examples of semiconductors.
, Behaviour of conductor in the absence of potential difference
The small dots represent the free
electrons and the red arrows
represent the random thermal
motion of the electrons
