CHAPTER 1: INTRODUCTION

1.1 General

Conversion of other forms of energies into electrical energy is a common practice.The main advantage of this conversion is that energy in electrical form can be transmitted, utilized and controlled more easily reliably and efficiently.Energy conversion devices are required first for converting other forms of energies into electrical energy and then for converting electrical energy into the required useful forms, such as sound, light, heat or mechanical energy.Another example is the conversion of sound energy into electrical energy at the talker's end, its transmission over lines in electrical form and its final conversion to sound waves at the listener's end.