Ohm’s law states that the electric current flowing
in a metallic conductor is directly proportional to the potential difference
across its terminals, provided physical conditions of the conductor such as
length, area of cross section, temperature and material remain constant.
If I is the
current and V is the potenial difference across the ends of a conductor then, V ∝ I
∴
V / I = R (Where ‘R’ is constant)
∴
V = IR
R is the
resistance which is constant for given conductor. The SI unit of resistance is
ohm ( Ω )
