Current is directly proportional to Voltage is Ohm's Law. V=IR is NOT Ohm's Law. V=IR is the definition of "Resistance"
We see that as per Ohm's law current through a conductor between two points is directly proportional to the voltage across the two points. More specifically, Ohm's law states that the relation between Voltage and Current is linear.
Ohm's law is an empirical relation that accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current. However, some materials do not obey Ohm's law, these are called non-ohmic.
We also see that you can replace the constant of proportionality with a constant called as "Resistance" and hence the relationship can be written as V=IR
Finally, we see that V=IR is NOT a definition of Ohm's Law. It is just a definition of Resistance. Whether conductor is following Ohm's Law or not, V=IR can be used to find the resistance.
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NCERT Physics Class 12
Chapter - Current Electricity
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1 июл 2017
