State the ohm's law. Explain how it is
used to define the SI unit of resistance.
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According to ohm's law, in a conductor , the current flowing (I) is directly proportional to the voltage (V) and inversely proportional to the resistance (R) .
I = V/R
or,. V = IR
unit of voltage is Volt(V)
and unit of electric current is ampere (A)
R = V /I
R = V/A
so, unit of resistance is Volt per ampere which is also ohm
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