لخّصلي

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.

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. In other words, energy conversion devices are required at both ends of an electrical system, since energy is neither available and nor required in electrical system. One typical example illustrating the processing of energy is a hydroelectric plant where energy is converted to electrical form. It is then transmitted and electric motor for final use. 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.

1.2 Meaning of Energy

The word-" energy" is widely used though", most people have only a conception of it. We use it but cannot touch it. We feel it in the blowing of the wind, in the warmth of the sun of the sun, in the cold of ice, and in the light of a lamp. Energy is known as "the capacity for work" or the ability to do work.