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**hm’s law**

**The current flowing through the conductor is directly proportional to the potential difference across its end provides the external condition like temperature,pressure remain constant.**

**Resistance**

**The hindrance offered by the conductor in the flow of current is called as resistance.**

**S.I unit ohm.**

**Conductivity**

**Conductivity is defined as the inverse of resistivity.**

**Limitation of ohms law**

**1.change in nature of material occur with passage of current.**

**2.increase of current possible of decrease in voltage.**

**3.decrease of current is possible decrease in voltage.**

**Ohmic and non ohmic conductor**

**The conductor which obeys ohms law is called ohmic conductor.**

**The conductor which do**

**not obeys the ohms law is called non ohmic conductor.**