If the physical conditions of the conductor (length, temperature, mechanical strain etc.) remains some, then the current flowing through the conductor is directly proportional to the potential difference across its two ends i.e. i ∝ V => V=iR ; where R is a proportionality constant, called as electric resistance.
1. Ohm's law is not universal laws, the substances, which obey ohm's law, are known as ohmic substance.
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2. Graph between V and i for a metallic conductor is a straight line as given. At different temperatures V-i graphs are different.
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3. The device or substances which don't obey ohm's law e.g. gases, crystal rectifiers, thermo-ionic valve, transistors etc. are known as non-ohmic or non-linear conductors. For these V-i curve is not linear.
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Static resistance 
Dynamic resistance 
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