CHAPTER ONE
1.1 INTRODUCTION
A wheat stone bridge meter is an important widely used device for rapid and precise measurement of electrical resistances. The meter bridge has existed since (1837) in London by sir Charles, the physicist and this development have occurred at a phenomenal rate in technology development. The wheat stone which consist of four resistances, P, Q, R, S joined to form a cross one pair a, e of opposite junctions and a sensitive galvanometer G. across the other junction, the galvanometer maintain the passage of current flowing into the circuit.
1.2 DEFINITIONS
A wheat stone bridge meter is defined as an instrument, used to measure an unknown resistance.
1.3 AIMS AND OBJECTIVES
Construction of wheat stone bridge meter.
1.4 LIMITATIONS
The limitation is based on the construction of the meter bridge.
1.5 STATEMENT OF PROBLEMS
They are:
(1) It is very scarce in I.M.T
(2) The materials used in constructing the meter bridge is very expensive especially the copper, brass terminals.
1.6 SIGNIFICANT OF STUDY
The study of wheat stone bridge have been very important in the laboratories in so many ways:
(1) It is used to measure the unknown resistance.
(2) It is used to know the type of resistance or classes suitable for the construction of electrical circuit bearing in mind the amount of potential different that will be applied to the circuit.
It is used to determine the amount of current flowing in the circuit.
CHAPTER TWO
2.1 LITERATURE REVIEW
A WHEATSTONE BRIDGE
During the ninetieth century, technological developments have occurred at a phenomenal rate. The advancement in science and technology has not only contribution to this development but has it set experience fantastic growth.
WHEAT STONE
Sir Charles, an English physicist, a founder of modern teregraphy from (1802 to 1875) determined the speed of electric discharge in conductors by means of a revolving mirror, in conjugation with W.F Cooke who took out a patent for the electric teregraphy in (1837). He investigated the transmission of sound in solid, furnished an explanation of chladnis figure and invested the concertina. He also studies optics in particular the eye, vision and there are various methods of measuring resistances such as application of ohm-meter, voltmeter, ammeter, potentiometer, and substitution method, the wheat stone bridge is an important and widely used device for rapid and precise measurement of electrical resistances.
The wheat stone bridge circuit which is illustrated in figure 1 below, consist of four resistances P, Q, R, S joined to form a complete circuits with a battery A across one pair, a, e of opposite junctions and a sensitive galvanometer G across the other junctions b, d.
FIG I: WHEAT STONE BRIDGE CIRCUIT