A coil of copper wire in a resistance of 90 Ω at 20o C and is connected to a 230 V supply. By how much must the voltage be increased in order to maintain the current constant if the temperature of the coil rises to 60C. Take the temperature coefficient of resistance of copper 0 0.00428/ oC A kilometer of wire having a diameter of 11.77 mm and a resistance of 0.031 Ω is drawn down so that its diameter is 5.0 mm. What does its resistance become?
A coil of copper wire in a resistance of 90 Ω at 20o C and is connected to a 230 V supply. By how much must the voltage be increased in order to maintain the current constant if the temperature of the coil rises to 60C. Take the temperature coefficient of resistance of copper 0 0.00428/ oC A kilometer of wire having a diameter of 11.77 mm and a resistance of 0.031 Ω is drawn down so that its diameter is 5.0 mm. What does its resistance become?
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter16: Installation Of Heating, Cooling, And Refrigeration Systems
Section: Chapter Questions
Problem 2RQ
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- A coil of copper wire in a resistance of 90 Ω at 20o C and is connected to a 230 V supply. By how much must the voltage be increased in order to maintain the current constant if the temperature of the coil rises to 60C. Take the temperature coefficient of resistance of copper 0 0.00428/ oC
- A kilometer of wire having a diameter of 11.77 mm and a resistance of 0.031 Ω is drawn down so that its diameter is 5.0 mm. What does its resistance become?
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