Solve the following problems and show your solution. 1. A coil of aluminum wire has a resistance of 50 when its temperature is 0°C. Determine its resistance at100°C if the temperature coefficient of resistance of aluminum at 0°C is 0.0038/°c.2. A coil of copper wire has a resistance of 20 at 18°C. If the temperature coefficient of resistance ofcopper at 18°C is 0.004/°C, determine the resistance of the coil when the temperature rises to 98°C?

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Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.
A coil of aluminum wire has a resistance of 50Ω when its temperature is 0°C. Determine its resistance, in ohms, at 100°C if the temperature coefficient of resistance of aluminum at 0°C is 0.0038/°C.
The resistance of a coil aluminum wire at 21OC is 210Ω. The temperature of the wire is increased and the resistance rises to 240Ω. If the coefficient of resistance of aluminum is 0 .0039/OC at 21OC, determine the temperature to which the coil has risen.
A coil is made up of 1000 turns of 0.5 mm^2 cross-sectional area copper wire. The average length each turn is 100 cm, and the copper resistivity is 0.02 µΩ m at 20 degrees Celsius. Determine the coil's resistance. Find the resistance of the coil at 20 degrees Celsius. * 30 ohm 40 ohm 50 ohm 60 ohm Find the resistance of the coil at 100 degrees Celsius if the temperature coefficient of resistance at 30 degrees Celsius is 3.7807 x 10^(-3) per degrees Celsius * 32.57 ohm 42.57 ohm 52.57ohm 62.57 ohm
2. A coil of copper wire has a resistance of 20 at 18°C. If the temperature coefficient of resistance of copper at 18°C is 0.004/°C, determine the resistance of the coil when the temperature rises to 98°C?
Determine the resistance of a copper tube 0.5 cm and 2 m long. The external diameter and resistivity are 10 cm and 9.071349x10-2 Ω-m respectively. A coil of annealed copper wire whose resistivity is 10.37Ω-CM/ft has 820 turns, the average length of which is 9 inches. If the diameter of the wire is 32 mils, calculate the total resistance of the coils at 20o C
Find the conductance of 100 ft of No. 15 AWG iron wire, which has a diameter of 64 mils. The temperature is 200 Find the resistance at 350C of an aluminum wire that has a length of 200 m and a diameter of 1 mm.
A coil of copper wire has resistance of 90 Ω at 20°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 60°C ? Take the temperature coefficient of resistance of copper as 0.00428 from 0°C.
If a coil of wire has a resistance of 20ohms at 40oC and 20 at 80oC,what will be the resistance of the coil at 0oC. oC = degrees celcius
a. Determine the ampacity of four heat resistant conductors up to 90 C of #10 gauge copper installed in a rigid tube at 30 C ambient temperature. b. What is the ampacity of a 500 KCMIL THHN insulated aluminum conductor at an ambient temperature of 60 C?
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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1. A coil of aluminum wire has a resistance of 50 when its temperature is 0°C. Determine its resistance at 100°C if the temperature coefficient of resistance of aluminum at 0°C is 0.0038/°C.