Discuss the variation of resistivity with temperature for insulators, semiconductors and conductors. Support your discussion with resistivity versus temperature graph/curves
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Discuss the variation of resistivity with temperature for insulators, semiconductors and conductors. Support your discussion with resistivity versus temperature graph/curves
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- A-How temperature affects the conductivity of conductive metals and how it affects semiconductors.semiconductors B-What is superconductivity, how does it relate to temperature? Some examples of superconductors.superconductors.Can the semiconductor model be used to describe the properties of a conductor and an insulator? A graph may help you make your case.Discuss briefly and give three (3) examples of each of the following classificationof solid materials:a) Conductorb) Insulatorc) Semiconductor
- What is meant by sheet resistivity, and how does this differ from the resistivity of a material? What are the units for sheet resistivity?Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025cm thick. If the width of the ribbon is 0.3cm, what length is required per element? Assume specific resistance of nichrome allow to be 109micro ohm-cm.What is extrinsic semiconductor? Mention explain its formation with suitable diagram. (a) Write any five differences between Conductor, Semiconductor ind Insulator.
- A wire of 59 in length and 4 mm2 has a resistance of 0.94 ohms. A 110-m length of wire of the same material has a resistance of 3 at the same temperature. Find the radius of this wire. The final unit must be in millimeter, mm.Each of three insulators forming a string has self-capacitance of "C" farad. The shunt capacitance of each cap of insulator is 0-25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.Briefly describe engineering materials
- A. Why does the conductivity of a semiconductor and some insulators change with impurity content? Compare this with the behaviour of metallic conductors. B. Discuss the location of the Fermi levels of intrinsic and extrinsic (n-type and p-type) semiconductors in low temperature and high temperature ranges. C. Discuss why the structure of the p-n junction is so important to modern technologies that impact our daily life.define the terms: -Semiconductors -Conductors -InsulatorsGive example problems with solution for resistivity and conductivity