Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 25, Problem 3ASA
Distinguish between a positive and a negative temperature coefficient of resistance.
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Chapter 25 Solutions
Physics Laboratory Experiments
Ch. 25 - Prob. 1ASACh. 25 - Prob. 2ASACh. 25 - Distinguish between a positive and a negative...Ch. 25 - Are the of a metal conductor and the of a...Ch. 25 - What are the circuit conditions when a Wheatstone...Ch. 25 - Prob. 6ASACh. 25 - What is the value of for copper in terms of...Ch. 25 - Prob. 3QCh. 25 - Prob. 4QCh. 25 - Prob. 5Q
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- When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.arrow_forwardSuppose at 70°C the resistance of a platinum resistance thermometer is 170 Ω. When placed in aparticular solution, the resistance is 7+100 Ω. What is the temperature of this solution?Temperature Coefficient of resistivity for platinum is 3.93 x 10-3 1/ 0 C.arrow_forwardA thermometer made of platinum has a resistance of 50 at 20 C, what is the measured temperature (in units of C) when it's resistance is 84.7. Assume the temperature coefficient of resistivity to be = 3.92 × 10^-3 C^-1arrow_forward
- A platinum resistance thermometer has resistances of 210.0 2 when placed in a 0°C ice bath and 234.8 2 when immersed in a crucible containing a melting substance. What is the melting point of this substance? (Hint: First determine the resistance of the platinum resistance thermometer at room temperature, 20.0°C.) °Carrow_forwardAluminum, copper, gold, and nichrome wires of equal lengths of 1.0 10-1 meter and equal cross-sectional areas of 2.5 10-6 meter2 are at 20.0°C. Which wire has the greatest electrical resistance?arrow_forwardA resistance thermometer, is made from platinum and has a resistance of 50.0 Ω at 20.0 °C. Calculate its resistance, when immersed in a vessel containing boiling water (100 °C ). Note that (the temperature coefficient of resistivity α = 3.92 x 10-3( °C )-1 )arrow_forward
- . Certain material has a resistance of 200 m2 at 20°C if the temperature coefficient of resistance for the material is 0.004°C-1 what will be its resistance at 1200°C?arrow_forwardDigital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than standard resistors. Find the temperature coefficient of resistivity (in (°C)-1) for a linear thermistor with resistances of 68.2 Q at 0.00°C and 2240 at 529°C. HINT (°C)-1 Need Help? Read It Watch Itarrow_forwardThe resistance of a certain power line is 1500 at 20°C. Find the line resistance when the sun heats up the line to 42°C (T-236°C and x=0.00391)arrow_forward
- A toaster has a Nichrome (a=4.5×104 °C-) heating element that has a resistance of Ro= 80 2 at a temperature T=20 °C. When the toaster is turned on, the resistance of the element rises to 92.7 Q and its temperature is increased. Find the final temperature (in °C) of the heating element. A Moving to another question will save this response. «< Question 5 of 12 Close Windowarrow_forwardA nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (ρρAI=2.82 x 10-8ohm.m ; ααAI = 3.9 x 10-3/°C; ρρhichrome = 2.50 x 10-6 m ; ααnichrome =0.40 x 10-3 / °C.) The ratio of the temperature change of the nichrome wire to thetemperature change of the aluminum wire is Select one: a. 10 b. 9.75 c. 0.1 d. 1arrow_forwardA certain metal has a temperature coefficient of resistivity of 0.0064 (°C) -1. A wire made from that material is connected to a source of constant voltage via a switch. At the instant the switch is closed, the temperature of the wire is 27 °C, and the initial power dissipated in the wire is Po. At what wire temperature has the power dissipated in the wire decreased to (1/2)Po? Number Unitsarrow_forward
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