Volume : II, Issue : VIII, August - 2013

A Study of Accuracy of Projection Method to Determine Low Resistance Using Wheatstone Bridge

Kavita R. Kolte

Abstract :

 Resistors are a very important part of any electrical circuit and hence its accurate measurement is of great importance. Resistors can be oadly classified as Low, Medium and High resistors. Wheatstone Bridge provides the most accurate way to measure medium resistances but to measure low resistance it gives significant error. Projection Method is a modification of Wheatstone Bridge wherein the four terminal of the Wheatstone Bridge are projected and connected to a four way key. In this paper we have measured low resistances from 0.1 Ω to 10 Ω and tried to find the accuracy in measurement by finding the standard deviation. The standard error has been calculated and using it the confidence limit of the measured data has been obtained. It is found that Projection Method gives very accurate measurement of standard resistances having low values of 01 Ω to 0.9 Ω but when the value of standard resistor becomes higher than 1 Ω, there is a significant standard deviation and mean value obtained also has a high value of error. Resistances of the value of 8 Ω and higher cannot be measured by Projection Method as deflection on both sides of the Bridge is not obtained. Thus Wheatstone Bridge can be effectively used to measure low resistance by using Projection Method technique.

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Kavita R. Kolte, A Study of Accuracy of Projection Method to Determine Low Resistance Using Wheatstone Bridge, International Journal of Scientific Research, Vol : 2, Issue : 8 August 2013

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