Superconductivity—

As we know the velocity of the electrons in the conductors increase as the temperature increase, so, the number of collision between the electrons also increases. As a result resistance of the conductor also increases. This relation is given by

                So, the phenomenon of complete loss of resistivity of certain metal or alloys when they are cooled below a certain temperature is called superconductivity and this temp is known as Critical Temperature.

Types of Conductors—

Two types of conductors,

1. Ohmic Conductors—The conductors which obey the Ohm’s law are called Ohmic Conductors. Ex-Metals.
2. Non-ohmic Conductors—The conductors which donot obey the Ohm’s Law are called Non-Ohmic conductors. Ex-Semiconductors.