What is meant by Ohm's law....?
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ANSWER
- Ohm’s law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and inversely proportional to the resistance of the circuit.
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According to ohm's law, the electric current flowing through a conductor is directly proportional to the potential difference applied across its ends, providing the physical conditions remain unchanged.
If V is the potential difference applied across the ends of a conductor through which current I flows, then according to ohm's law,
V ∝ I [at constant temperature]
or V = IR
or I = V/R
where, R is the constant of proportionality called resistance of conductor at given temperature.
From the above formula, it is clear that current is inversely proportional to resistance. If resistance is doubled then current gets halved and if resistance is halved then current gets doubled.
NOTE : The conductors which obey ohm's law are called ohmic conductors while the conductors which to not obey ohm's law are called non-ohmic conductors.