15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 18.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.8 A, while at 92.0°C it reads 17.1 A. You can ignore any thermal expansion of the rod. Find the resistivity in μm at 20.0°C. Round-off to the nearest hundredth.

15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 18.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.8 A, while at 92.0°C it reads 17.1 A. You can ignore any thermal expansion of the rod. Find the resistivity in μm at 20.0°C. Round-off to the nearest hundredth.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 25P: A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of...

See similar textbooks

Similar questions

A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
Taking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P21.49
A 1.70 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 12.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.3 A, while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. Find the resistivity for the material of the rod at 20.0°C. Express your answer in ohm-meters. p= Submit Part B ΑΣΦ α= Request Answer ? Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. V— ΑΣΦ Ω· m ? (°C) -¹
Integrated Concepts. A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. At what rate (in oC/min ) will its temperature increase if its mass is20.0 kg and it has a specific heat of 0.300 kcal/kg. oC, assuming no heat escapes?
15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 18.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.8 A, while at 92.0°C it reads 17.1 A. You can ignore any thermal expansion of the rod. Find the resistivity in at 20.0°C. Round-off to the nearest hundredth.
24.1% Resources Lx Give Up? Hint The Iceberg Kid, infamous for imposing a deep freeze on whoever disagrees with him, discovers that in his advanced teenaged years his hands constantly feel chilled. As he is a cool physics student, the Iceberg Kid quickly calculates the resistance of the resistor needed to warm his hands. Given that 177 J of thermal energy is generated by the resistor during 7.69 s of operation while connected to a 12.0 V battery, find the correct value of this resistance (and avoid a cold, cold fate). resistance: Ω
What current flows through a 2.45-cm-diameter rod of pure silicon that is 21.5 cm long, when 1.00 x 10³ V is applied to it? (Such a rod may be used to make nuclear particle detectors, for example.) 0.000877 X A
The rear window of a van is coated with a layer of ice at O°C. The density of ice is 917 kg/m³, and the latent heat of fusion of water is 3.35 x 105 J/kg. The driver of the van turns on the rear-window defroster, which operates at 12 V and 19 A. The defroster directly heats an area of 0.36 m² of the rear window. What is the maximum thickness of ice above this area that the defroster can melt in 2.3 minutes? Number MO Units
Consider a resistor made of copper that you connect to a 12.0 V power supply in an oven where the temperature is 300°C. In this heat, you find that a current of 2.00 A goes through the resistor. Determine the current that goes through this resistor if you connect it to the same power supply but this time on the surface of Mars where the temperature is about -100°C. Take a 3.9x10-3 °C-1
An insulated piston–cylinder device initially contains 0.3 m3 of carbon dioxide at 200 kPa and 27°C. An electric switch is turned on, and a 110-V source supplies current to a resistance heater inside the cylinder for a period of 10 min. The pressure is held constant during the process, while the volume is doubled. Determine the current that passes through the resistance heater.
The rear window of a van is coated with a layer of ice at 0°C. The density of ice is 917 kg/m³, and the latent heat of fusion of water is 3.35 x 105 J/kg. The driver of the van turns on the rear-window defroster, which operates at 12 V and 27 A. The defroster directly heats an area of 0.48 m² of the rear window. What is the maximum thickness of ice above this area that the defroster can melt in 2.9 minutes? Number i ! Units m
A 1.50 m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0V across its ends, while an ammeter measures the current through it. You observed that at room temperature ( 20° C ) the ammeter reads 18. 5 A, while at 92.0° C it reads 17.2 A. a). Which of the following is its resistivity at 20° C?(p). [ Select ] in N.m. b). Which of the following is the temperature coefficient of resistivity at 20°C for the material of the rod? [ Select ] in °C-1