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CHAPTER ONE INTRODUCTION 1.1 BACKGROUND TO THE STUDY Drying is one of the oldest methods of food preservation. For many years, people have been preserving agricultural products by drying until caning was developed at the end of the 18th century (Ekechukwu and Norton, 1999). The importance of dried foods cannot be overestimated as the kitchens and food stores in any country will confirm the quantity and diversity of dried food ...

CHAPTER ONE INTRODUCTION  1.1 BACKGROUND OF THE STUDY  Traditionally, high control in home and office environments takes place through switches (on/off), deals and sliders (dimmers) and sometimes motion sensors. These controls can be incorporated in the built environment such as walls, or attached to lights that people place themselves (desk lamps, bed side lights). This often leads to a jumble of controls each with their own location, interaction style, and ...

ABSTRACT This research work examines the factors affecting  power  outage in Nigeria. Constants Power supply is the hallmark of a develop economy. Any nation whose energy need is epileptic in supply prolongs her development and risk-losing potential investors. Nigeria with population of over 120 million people has for the past 40 years of establishment of National Electric Power Authority (NEPA)agency  empowered with the electricity generation, transmission and distribution, experience frequent  ...

CHAPTER ONE   INTRODUCTION   WHAT IS A BATTERY CHARGER: A battery charger is a device used to put energy into a secondary cell or rechargeable battery. By forcing on electric current through it. The charge current depends upon the technology and capacity of the battery being charged. For example, the current that should be applied to recharge a 12v car battery will be very different from the current for a ...

ABSTRACT   This uninterruptible power supplies device has the capability of converting from 12volts D.C to 220volts alternating current at the frequency of 50Hz with the help of a step-up transformer. The main importance of this device is its ability to ensure absolute continuity of power to the computerized control system thereby protecting a critical equipment from electrical supply failure. Ups system achieve this by rectifying the mains supply, using ...

ABSTRACT The need for a remote control system that can control domestic appliances and various lighting points and sockets has often been a concern for uses at times uses find it inconvenient and time they are leaving the house for work it has also often led to damage of appliances due to the fact that an appliances was not timed off before leaving the house. The objective of putting up. ...

CHAPTER TWO LITERATURE REVIEW This chapter will give an insight into the meaning electronics display board system, ways by which could be achieved, here some discrete components such as resistors, capacitors and transistors with integrated circuits (IC) were used to make this work and it’s wiring easier to understand. By the end of this chapter, one would stand a better chance of having an understanding of what electronics display board ...

ABSTRACT Transformer is one of the indispensable devices mostly in Electric Power Transmission, Transformer Step-down or Step-up, the output voltage/current to the design requirement. This project was meant to show the necessary step and methods of designing and constructing a typical step-up auto transformer with tapping. In this project, we gathered information from both primary data (personal interview) and secondary data (information from textbook and internet).  The project work consist ...

CHAPTER ONE 1.1             INTRODUCTION The light sensitive alarm is an electronic circuit that detects a sudden shadow falling on the light sensor and sounds the bleeper. When this happens, the circuit will respond to gradual charges in brightness to avoid false alarm. The beeper sounds for only a short time to prevent the battery from running flat. Normal light can be use. The circuit will work best if a beam of ...

ABSTRACT This project is basically on the repair of a damaged air conditioner.  It is intended to provide a break through in the restoration of any damaged air conditioner and thereby curtail the huge expenses incurred in the replacement of the entire unit. This report covers an introduction into what an air conditioner is all about, it’s historical background and working principle. A view on the installation techniques and the maintenance ...

CHAPTER ONE INTRODUCTION 1.1    BACKGROUND TO THE STUDY In our society today writing a project is all about applying the theories  learnt over the year to produce design and construct and operating system which will be capable of performing a known task. It is from this point of view that we decided to write, design and construct this particular project which has the titles construction and design of distance proximity sensor ...

CHAPTER 1 INTRODUCTION 1.1  PROJECT OVERVIEW Battery level indicator is a circuit that is used to check the battery life. We can easily recognize the battery level with the help of LED’s. It uses a LM3914 driver IC use to drive 10 leds by passing through it sufficient amount of current. Brightness of leds are controlled by reference adjustable pin and reference out pin. A variable resistor is also deployed in ...

CHAPTER ONE INTRODUCTION 1.1 Overview: Traffic lights are used to control the vehicular traffic. Now a day the road accident is increasing clay by day due to careless driving. Breaking of traffic rules. Insufficient traffic police and absence of traffic control system on the road. Everyone has different types of vehicles resulting in rise to the numbers of vehicles. Traffic light is the one of the vital public facilities plays ...

ABSTRACT This project work describes the construction and designing of 12volt car battery charger with USB port for charging mobile phones. The charging process is focus more on 12volt lead car batteries commonly used in vehicles. This design was done by using I.C LM7812 and LM7806 with transformer of 230 volt and series of other electrical component highlighted in the work to achieve our goal. The charger was able to ...

ABSTRACT Virtually in all human endeavors, there is always an element of control. Even our behavioral patterns and manner of interactions are either internally or externally guided for a meaningful life appreciation. Control then is necessary especially when something poses a danger or get to excesses. In cities today, the increase of road transportation traffic congestion at strategic junction has made it absolutely important to look beyond using traffic wardens ...

CHAPTER ONE INTRODUCTION Background of the Study             Effectiveness of electrical/electronics technology programme in technical colleges can be determined through appropriate measurement. Technical education and training lead to acquisition of employability skills. Individuals choose careers in education with the hope of securing employment in that field and enjoying a certain level of income based on the qualification attained. The extent to which the graduate of technical education and training programmes ...

  ABSTRACT The main purpose of the study was to assess apprenticeship system and labour supply of electrical installation artisans in Enugu State.  Eight research questions guided the study while five null hypotheses were formulated and tested at 0.05 level of significance. The study adopted descriptive survey design. The study was carried out in Enugu State of Nigeria. The population for this study consisted of 234 electrical installation apprentices drawn ...

CHAPTER ONE                INTRODUCTION 1.1 OVERVIEW A siren is a loud noise making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulance, police cars and fire trucks. There are two general types of siren: 1-Pneumatic Siren 2-Electronic Siren Many fire sirens (used for calling the volunteer fire fighters) serve double duty ...

ABSTRACT   In this project work, we are mostly concern about building a simple power streetlight which is automatically operated. There are four main components required to build a solar operated streetlight. The solar array, High efficiency D.C lamp section made by transistor, resistors, and the sensor LDR, changes controller which is made up of diode, resistors, LED, capacitor, and a battery of which the solar array is the most ...

CHAPTER ONE INTRODUCTION 1.1 Overview: The primary objective of the contents of this file is to provide adequate breadth and depth for basics in electronic components at the undergraduate level. The document contains the procedure right from drawing the circuit diagram on the page to its implementation on the Printed Circuit Board. It includes the information of the basic components of electronics like the capacitor, resistor, diodes and also a ...