Download Complete Project Materials on Design And Construction Of A Variable Resistance Box From chapter one to five with abstract and references
ABSTRACT
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In this project a resistance box has been constructed using locally available materials namely, 1/3 and plywood for the construction of the box, cupper wire, Ferro board, soldering iron, soldering lead, screw and resistors.
The resistance obtainable from the box ranges from 2-11W. The box is fitted with terminal s to allow easy use in physics laboratory practical. At the end of the experiment, the values obtained are very close to those obtainable using imported box.
TABLE OF CONTENT
Title page
Certification
Dedication
Acknowledgment
Abstract
Table of content
CHAPTER ONE
1.1 Introduction
1.2 Aim of the project
CHAPTER TWO
2.1 Resistor
2.2 Theory of operation
2.3 Classification of resistors
2.4 Factor affecting resistances
2.5 Reactivity and conductivity
2.6 Resistor colour codes
2.7 Symbols of resistor across battery
2.8 Uses of resistors in a circuit
CHAPTER THREE
3.1 Design and construction
3.2 Other components of the box
CHAPTER FOUR
4.1 Test and experiments
4.2 The box in a simple circuit
4.3 Discussions
CHAPTER FIVE
5.1 Summary
5.2 Conclusion
5.3 Recommendation
References
CHAPTER ONE
1.1 INTRODUCTION
In many electrical measurements, standard variable resistances are required. These standard resistances come in various forms and shapes. The resistance box is one of them.
These resistance boxes are imported and in most cases very expensive. Most schools can therefore not afford to buy enough for the use of there students. It is therefore important for technologists to be able to improvise using locally available materials.
Also, during the course of designing and construction, student technologists are really exposed to more practical works in order to acquired a lot of experience on how to make use and handle many laboratory tools, equipments and apparatus.
We have two different, types of resistance boxes which includes:
(a) Decade type
(b) Plug type
In decade type, the coil of each resistance are connected in series, and there is a rotary switch which also aids in contact with each other. The switching used are of high quality compared with the resistance of the coils which they are selected.
In plug type, no switches are required instead, their resistance is varied by means of plugs. The resistance coils are formed across gaps with a thick brass bar, and the gaps are formed in the holes being drilled to receive the short circuiting plugs.
1.2 AIM OF THE PROJECT
This project aim at presenting precisely the process of construction of a resistance box, which is an imported equipment in the physics laboratory.
Most practical work involve the use of resistors of fixed value that are fixed into and later removed from the circuit. The replacement of a particular resistor of a given value may lead to destruction of the resistor so an alternative way for guiding against this is by use of variable resistance box.
This resistance box is to provide a resistance range between two and eleven (2-11W), a range commonly used in many practical experiments.
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