When the temperature remains constant, current flowing through a conductor is directly proportional to the potential difference across the conductor.
OHM'S LAW
When
voltage is applied to a closed circuit, it causes a flow of electrons and
consequently there exists current in the circuit. The resistance of the circuit
opposes this current flow. The actual value of the current flowing through the
circuit depends on the applied emf and resistance in the circuit, the
relationship is being given by Ohms' law.
Statement
of Ohm's Law
When
the temperature remains constant, current flowing through a conductor is
directly proportional to the potential difference across the conductor.
Mathematically,
we may write
V∞
I (Temperature being constant)
(or)
V = IR ….. (6)
where
'R' the constant of proportionality becomes the resistance when E is in volts
and I is in ampere.
Limitations
1.
Ohm's law does not apply to all non-metallic conductors.
2.
It is not applicable to non-linear devices such as zener diode, vacuum tubes
etc.
3.
Ohm's law is true for metal conductors at constant temperature. If the
temperature changes, the law is not applicable.
Electric Circuit Analysis: Chapter - 1: Basic Circuit Analysis - DC : Tag: : Statement, Formula, Limitations | Electric Circuit Analysis - OHM'S Law