9. What is the area in circular mils (CM) of a conductor whose diameter is 0.25 inch?A. 65,000B. 62,500C. 70,000D. 67,50010. A copper bar has a length of 20 ft, width of 4 inches and thickness of 0.5 inch. If the resistivity ofcopper is 10.37 0-CM/ft, what is the resistance of the bar?A. 81.4 µnB. 8.14 μΩC. 814 μΩD. 0.814 μΩ

Answered: Image /qna-images/answer/f76fb78a-5503-4de6-9ec3-98d489ee1c2a.jpg

Answered: 9. What is the area in circular mils…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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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.
The temperature of coefficient of resistance of copper at 0°C is 0.004626/°C. If the tip to tip of a conductor is 110 milli ohm at 0°C, to what value will the resistance increases at a temperature of 80°C?
Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025 cm think. If the width of the ribbon is 0.3cm, what length is required per element in cm? Assume specific resistance of nichrome alloy to be 109microOhm-cm.
A copper wire has a resistance of 0.85 ohm at 200C. What will be its resistance at 400C ? Temperature coefficient of resistance of copper at 00C is 0.004/0C.
Calculate the electrical conductivity of pure platinum at -200oC. data: resistivity of Pt a Tamb = 9.85x10-6ohm.cm; resistivity coefficient per T of Pt (a = 0.0039 ohm / ohmoC)
The temperature coefficient of resistance at 30°C of a conductor is 0.003759. If it has a resistance of 1.25 Ohm at 25° C, determine its resistance at 40° C.
Determine the thermal coefficient of resistance of copper at 50°C, then use this value todetermine the resistance of copper wire at 170° if the resistance of this copper wire at 50°C is50ohms. The thermal coefficient of resistance of copper at O°C is 0.004264/C°
the resistance of copper wire with a=0.00393/C is 183ohms at 46C, its resistance would be about
A piece of silver wire has a resistance of 1 ohm. Determine the resistance of alead wire one-third the length and one-third the diameter if the resistivity of lead wire is 30 times that of silver. NOTE: Please explain where did you get the variables so I can understand them. Thank you
nichrome ribbon resistor elements each has a resistance of 1 ohm. the element is made from sheet of nichrome alloy, 0.025 cm thick. if the width 9f the ribbon is 0.3 cm , what is the length is required per element? assume specific resistance of nichrome alloy to be 10g micro ohm-cm
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