Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Concept explainers
Question
Chapter 25, Problem 1ASA
To determine
Whether the resistance of all the substances increases with temperature or not.
Expert Solution & Answer
Answer to Problem 1ASA
The electric resistance of a substance changes with the change in temperature.
Explanation of Solution
With the changes in temperature of a substance, the electric resistance of the substance also changes. The change in resistance of a substance is directly proportional to the temperature change. The resistance-dependent temperature is typically expressed as coefficient of resistance.
Conclusion:
Material resistance doesn't need to increase with temperature rise. Some metals are responsive to temperature rise whereas certain materials, like carbon, show decreased resistance to temperature rises.
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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_forwardUse the atomic theory of matter to explain why the resistance of a material should increase as its temperature increases.arrow_forwardWhen 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_forward
- Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?arrow_forwardReview. When a straight wire is warmed, its resistance is given by R = R0,[1 + a(T T0)] according to Equation 27.20, where a is the temperature coefficient of resistivity. This expression needs to be modified if we include the change in dimensions of the wire due to thermal expansion. For a copper wire of radius 0.100 0 mm and length 2.000 m, find its resistance at 100.0C, including the effects of both thermal expansion and temperature variation of resistivity. Assume the coefficients are known to four significant figures.arrow_forwardIf electrical energy costs 0.12 per kilowatt-hour, how much does it cost to (a) burn a 100-W lightbulb for 24 h? (b) Operate an electric oven for 5.0 h if it carries a current of 20.0 A at 220 V?arrow_forward
- What is the resistance of a wire made of a material with a resistivity of 3.2 x 10 -8 12 m if its length is 2.5 m and its diameter is 0.50 mm?arrow_forwardThe resistance of a wire increases by 22 percent when the temperature of the wire is increased from 10 degrees C to 105 degrees C. What is the temperature coefficent (a) of the wire's material?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_forward
- MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A certain laboratory experiment requires an aluminum wire of length of 30.0 m and a resistance of 4.40 Q at 20.0°C. What diameter wire must be used? (The resistivity of aluminum at 20.0°C is 2.82 x 10-8 Q m.) mm Need Help? Read Itarrow_forwardA copper wire of length 25 m has a resistance of 0.55 Q at 20°C. a) What is the radius of the wire? b) What is the resistance of the same wire at a temperature of 80°C? c) At what temperature the resistance of the wire will be doubled from that 20°C?arrow_forwardA 5-meter-long conductor with diameter of 5mm is connected to a source and an external resistance. The temperature of the conductor changes from 25 degrees to 35 degrees. Determine the resistivities and resistances at each temperature. Thermal coefficient of the conductor is 40 x 10-³and the conductivity at 20°C is 2.5465 x 10 4 per ohm-meterarrow_forward
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