By: Yin Kithsiv

Abstract

Why study electronics? Try to imagine living today without using electronics. You would have no electric lights, no telephone, no television, no calculators, no doorbell to announce your friends and any number of other things we call “necessities” today. You would not buy a radio, a computer, microwave ovens or a flashlight. Electronics have made life not only easier and more interesting but also more complicated.

In this thesis, there are four chapters. Chapter one is described about the electronic history, systems, and component. Chapter two is the passives devises, and there are resistor and capacitor.  One of the main tools used in controlling electricity is the resistor. So, the first portion of this chapter deals with resistors and their functions. Then, the chapter covers some basic types of circuits-series and parallel. You also learn how to use Ohm’s law on circuits. This law helps you find out what to expect from a circuit.

A capacitor is a device that opposes any change in circuit voltage is called capacitance. Capacitors make it possible to store electric energy. Electrons are held within a capacitor. This, in effect, is stored electricity. It is also known as electrical potential or an electrostatic field. Electrostatic fields hold electrons. When the buildup of electrons becomes great enough, the electrical potential is discharged. This process takes place in nature:  Clouds build electrostatic fields. Their discharge is seen as lightning. A capacitor performs two functions within a circuit: - A capacitor opposes changes in circuit voltage. - A capacitor stores electrostatic energy. Chapter three is the active devices, and there are semiconductor, diode, and transistor.

The term semiconductor, as you know, describes a material that resets the flow of electrons. A semiconductor material lies between conductor and insulators in terms of electron movement. The same word, semiconductor, also identifies a type of electronic device.  Included are transistors and diodes. These units have played key roles in the development and growth of the electronics. In this charter, you learn about semiconductor devices, how they function, and how they are connected into circuits.

Diodes are very important in electronic circuits. They perform many functions. Everyone working in electronics must be familiar with diodes. Your study of diodes will enable you to predict when they will be on and when they will be off. You will be able to read their characteristic curves. Also you will be able to identify their symbols and their terminals. This chapter will also introduce some of the ways that diodes are used. You will find them very popular electronic components.

Transistors are solid-state devices similar in some ways to the diodes you have studied. Transistors are more complex and can be used in many more ways. They are very important and can be found in almost all modern electronic equipment. The most important feature of transistors is their ability to amplify signals. Amplification can make a weak signal strong enough to be useful in some electronic applications. For example, an audio amplifier can be used to supply a strong signal to a loud speaker.

Chapter four is the Operated circuits of electronic. This chapter described about electronic circuits in the television and its advantages.

Institution: Royal Academy of Cambodia

Supervisor: Chhum Navy (Ph.D)

Degree: Master of Physic