What is Ohm's Law ?
A German physicist "George Simon Ohm" determined the exact relationship between the current flowing through a conductor and potential difference across it's ends in 1827. This relationship is knows as the Ohm's law.
According to this law The current passes though a conductor or wire is directly proportional to the applied voltage across it's ends, when the physical properties of the conductor (such as the temperature, cross section area, length, material) are remains unchanged.
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| Ohm's law circuit |
If V is the applied voltage across the conductor and I is the current flowing through the conductor then according to Ohm's law...
At constant temperature
V ∝ I
V= IR
I= V/R equation .... (1)
where, R is the proportionality constant in above relation, which is known as the Resistance of the conductor.
From equation ..(1), It is clear that the current is inversely proportional to the resistance R .
If the value of resistance is decreasing then the value current is increasing and the value of resistance is increasing then the value of current is decreasing.
What is Resistance ?
Unit of Resistance R
If the voltage is measured in volts and the current is measure in amperes then the resistance of the conductor is measured in
Volts/Amperes = Ohm's (Ω)
If the current flowing through a conductor is 1 Ampere and the applied voltage across it is 1 volt then the resistance of the conductor is said to be 1 Ohm (Ω)
1 Volt /1 Ampere = 1 Ohm (Ω)
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