1. A given material has a resistance of 20 2 at room temperature (20°C) and 25 Q at a temperature of 85°C. a) Does the material have a positive or a negative temperature coefficient? Explain briefly. b) Determine the value of the temperature coefficient, a, at 20°C. c) Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0°C (the freezing point of water) and at 100°C (the boiling point of water).

1. A given material has a resistance of 20 2 at room temperature (20°C) and 25 Q at a temperature of 85°C. a) Does the material have a positive or a negative temperature coefficient? Explain briefly. b) Determine the value of the temperature coefficient, a, at 20°C. c) Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0°C (the freezing point of water) and at 100°C (the boiling point of water).

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.2P: The temperature dependence of resistance is also quantified by the relation R2=R1[ 1+(T2T1) ] where...

See similar textbooks

Similar questions

1. A given material has a resistance of 20 2 at room temperature (20°C) and 25 at a temperature of 85°C. a) Does the material have a positive or a negative temperature coefficient? Explain briefly. b) Determine the value of the temperature coefficient, a, at 20°C. c) Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0°C (the freezing point of water) and at 100°C (the boiling point of water).
The wires of our appliances are insulated with a material mixed with rubber, which has a very high resistivity. If a certain wire has a length of 2.5 m and the outer diameter is 5mm and its inner diameter is 0.5mm, what is its resistance? Note that the inner diameter is present to leave a hallow place where conducting wire ( usually copper) is present. Follow the format: Given: Required: Equation: Solution: Answer:
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.
The rate of change in resistance of a conductive wire ( ) with respect to its temperature ( ), is found to be equal to the product of the temperature coefficient of resistance ( ) and the resistance at that temperature. If the variation of the resistance is continuous with respect to the temperature,
How does the power, P, dissipated by a resistor depend on the indicated parameter (resistance, R,of the resistor, or the voltage or current of the supply) for each of the following scenarios? I amlooking for a mathematical equation for power as a function of the indicated parameter followed bya description of the dependence - does the power increase, decrease, remain the same or some otherdependence, as the parameter is increased? (and if other, describe.) If it is increasing or decreasing,by what factor does the power change if the parameter is increased by a factor of 3?(a) Constant R, powered by ideal voltage supply (We will examine real batteries that have internalresistance in class and the next homework.) How does P depend on the voltage, V, of thesupply?(b) Constant R, powered by ideal current supply. How does power depend on the current I?(c) Ideal battery operating at a fixed voltage, powering a variable resistor R. How does P dependon the resistance, R, of the resistor?(d)…
Give realtive relations between and relative parameters for the following: 1.) ohmic resistance 2.) ballistic transport 3.) quantification of conductance
A cylindrical copper rod having a diameter of 0.40 in has a resistance of 0.00264 Ω. Taking the resistivity of copper as 1.745 µΩ-cm at 20o C, determine the length of the rod in ft. resistance of the rod when it is drawn down to one-third of the initial diameter, the volume remaining unchanged. Assumed that the resistivity of the copper is not affected by the drawing process.
the resistance of a given electric device is 46 ohms at 25 °C . if the temperature coefficient of resistance of the material is 0.00454/°C at 20°C. determine the temperature of the device when its resistance is 92 ohms
Discussions:Voltage Distribution and String Efficiency of a Model Suspension Insulator 1- Comment on the results obtained.2- Give reasons for unequal potential distribution over the string.3- What is the effect of this un equality on the insulators?4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?
The resistance of a certain electrical device is 46 ohms at 25° C. If the temperature coefficient of the material is 0.00454 at 20° C, determine the temperature of the device when its resistance is 92 ohms.
A company wants to produce a ductile material with improved properties. Would impurity atoms of similar or dissimilar atomic size be better at maintaining the ductility of a metal?How does the impurities affect the crystal structure and properties of a solid?Justify your answer with a valid reasoning.
Compute for the resistance of (i) silver, (ii) copper, and (iii) aluminum wire using these Equations in the given. For the three wires, the length is 2 meters, the diameter is 1 millimeter, and the temperature is at 27◦C.