Design And Construction Of A Metre Bridge

Project and Seminar Material for Science Laboratory Technology SLT

Design And Construction Of A Metre Bridge


Abstract


The work started with an extensive literary research in an attempt to find out facts about the instrument. This led to probing the history of Wheatstone bridge, hour it was developed up till the point Wheatstone Bridges of different designs were made.

This work deals with metre Bridge which is one of the fundamental instrument in most physics laboratories. Metre Bridge is a topic under electricity, is an instrument made up of wooden board metre rule, wire, usually constantan, and metal strips (standard resistor, unknown resistor, galvanometer, battery, sliding contact, and keys are included when the metre bridge is in use.


Table of Contents


  • Title page
  • Certification
  • Dedication
  • Acknowledgement
  • Abstract
  • Table of contents

Chapter One

  • 1.1 Introduction
  • 1.2 Description
  • 1.3 the Theory of the Bridge
  • 1.4 Types of Wheatstone Bridge
  • 1.5 Description of the Metre Bridge
  • 1.6 Factors that Affect Metre Bridge
  • 1.7 Precautional Measures
  • 1.8 Aim of the Study
  • 1.9 Objective of the Study
  • 1.10 Statement of Problem
  • 1.11 Significant of the Study
  • 1.12 Limitation of Study

Chapter Two

  • 2.1 Construction of the Metre Bridge
  • 2.2 Operation for Construction of Bass Board
  • 2.3 Copper Strips
  • 2.4 Brass Terminals
  • 2.5 Mounting of Component of the Board

Chapter Three

  • 3.1 Design of the metre Bridge
  • 3.2 Specifications
  • 3.3 Wooden Board
  • 3.4 Metal Strips
  • 3.5 Screw for the Wire
  • 3.6 Holder for the Wire
  • 3.7 Close Up Strips
  • 3.8 Terminals
  • 3.9 Design of Metre Bridge

Chapter Four

  • 4.1 Calibration of constructed Bridge
  • 4.2 Comparison with Standard Metre Bridge

Chapter Five

  1. 5.1 Findings
  2. 5.2 Recommendations
  3. 5.3 Conclusion
  4. References

Chapter One


Introduction

1.1 Background History of Wheatstone Bridge

The study of electricity is an important aspect of physics because electricity plays a key role in the modern world. The working of most modern appliances such as radio, television, computers and calculators, refrigerator, air conditioners, sound systems and electric fan is possible as a result of electricity.

There are three basic quantities, which must be clearly understood before we can proceed with the subject of electricity. There are electric current, potential difference and electric resistance. One needs to have the knowledge of circuit board and work with a variety of circuit including voltage dividers, the wheatstone bridge.

Sir Charles Wheatstone (1802 – 1873) was a British Scientist and inventor of telegraph systems. He began as a musical instrument maker in London, but his scientific was to select the best result, which resulted in an outstanding paper on acoustic he presented to the Royal Society in (1833 – 1834) he became a professor of Physics at Kings College London, and distinguished himself in research in electrical science.

With William Forhergill cook, he invented major component of England’s first telegraph system. He also intended scientific instrument and a self-excited electrical generator (the dynamic) about the same time as Werner Von siemens. His keen intellect was demonstrated by his ability to deciphjer hieroglyphies. In 1868, he was knighted.
Wheatstone bridge, as it is common known was first described by Sott Chirstle in 1833 but came into use about 1843. when wheatstone Charles called attention to Christle’s work, since then wheatstone bridge has been the name applied to this instrument.


1.2 Description

This is a device for measuring electrical resistance. In fact, there are many methods for measuring resistance such as the use of potentiometer, ammeter, Voltmeter, ohm-meter and by substitution method, by these the most accurate and suitable method of measuring and comparing resistances is that due to wheatstone bridge. This method makes use of division circuit, which in this case, is known as wheatstone bridge. The wheatstone bridge circuit is shown in the figure I below:

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