Thursday 14 February 2013
OHM'S LAW
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Ohm's law states that the current through a conductor between two
points is directly proportional
to the potential difference across
the two points. Introducing the constant of proportionality, the resistance one arrives at the usual
mathematical equation that describes this relationship:
V = I R
I = V / R
In physics, the term Ohm's law is also used to
refer to various generalizations of the law originally formulated by Ohm. The
simplest example of this is:
J = σ
E
IMPORTANT POINTS
1) Ohms law is applicable to linear passive bilateral circuits (At const.
temp)
2) it is not applicable to active elements
3) it depends on nature of elements
4) Ohm's Law doesn't apply to many semiconducting devices, because
they are not linear or ohmic -that is the ration of voltage to current
doesn't remain constant for changes in voltage. Semiconducting devices,
such as diodes, are termed 'non-linear' or 'non-ohmic' because their ratio of
voltage to current changes whenever the applied voltage changes.
5) Ohms law is applicable only for Elements but not Sources.
6) Ohm's law is applicable only Lumped elements
7) Ohm's Law is applicable only When Temparature is kept constant.
8) Ohm's law is applicable for Field Theory
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