We have discussed about the use and importance of transformer in chapter 7. The
transformer comes in picture when we have electrical power but as we have discussed
that, Electrical energy is the form which is neither available nor required for any
application. The available form of energy at first stage is normally mechanical energy
in the form of potential energy of water, energy released by the combustion of coal or
fusion energy of heavy radioactive atom etc. Also the required form of energy at final
stage is normally mechanical energy to rotate our fans, wheel of train, and movement
of various parts in case of mills etc. But the problem with mechanical energy is that
this is available at one place and required at another place and its transfer from
available point to required point is almost impossible. And with the fact of electrical
energy that it can be transferred for a very long distance easily and safely. The conversion
of energy is required through the machines. These machines are called electromechanical
energy conversion devices.