In a solid, atoms vibrate about their equilibrium position at ordinary temperature and the amplitude of vibration decreases to a minimum at absolute zero of temperature .This vibration of atoms brings elastic distortion in the lattice and, therefore, the waves associated with the vibrations are the elastic waves of varying frequencies. Continue reading “THERMAL CONDUCTIVITY OF METALS”

## HEAT DEVELPOED IN A CURRENT CARRYING CONDUCTOR

Let us discuss the heat developed in a current carrying conductor and derive a relation for the same.

According to Joule’s law, the heat developed in a conducting wire is given by I^{2} R,

Where I is current flowing through the wire having resistance R.

If p is the electrical resistivity of wire,

L is the length of wire and

A is the area of cross section of wire Continue reading “HEAT DEVELPOED IN A CURRENT CARRYING CONDUCTOR”