Thermocouple Lab Report Sample

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ANALYSIS OF THE SEEDBECK EFFECT OF SOME THERMOCOUPLES A.S. Ogungbe*, O.O. Babalola, E.O Onori, C.O. Ogabi, O.A. Adejo Department of Physics, Lagos State University, Ojo, Lagos, Nigeria *Email: ogungbea@yahoo.co.uk
ABSTRACT
A thermocouple is a temperature-measuring device that consists of two dissimilar conductors that are joined at each end. In this experiment, two junctions were created between two different materials; Nichrome and Constantan, Copper and Constantan, and Nichrome and Copper, by twisting the wires firmly together. The voltmeter leading to the two free ends was set to the most sensitive DC voltage (200 mV). The voltage was measured and recorded with both junctions at room temperature. One junction was inserted into an ice block at
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INTRODUCTION
A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots, where a temperature differential is experienced by the different conductors or semiconductors (Kerlin and Johnson, 2012). It produces a voltage when the temperature of one of the spots differs from the reference temperature at other parts of the circuit. Thermocouples are a widely used type of temperature sensor for measurement and control, and can also convert a temperature gradient into electricity.

Any junction of dissimilar metals will produce an electric potential related to temperature. Thermocouples for practical measurement of temperature are junctions of specific alloys which have a predictable and repeatable relationship between temperature and voltage. Different alloys are used for different temperature ranges. Properties such as resistance to corrosion may also be important when choosing a type of thermocouple (Burns and Scroger,

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