Electrical power generators are sometimes "load tested” by passing current through a large vat of water. A similar method can be used to test the heat output of a resistor. A R = 30 Ω resistor is connected to a 9.0-V battery and the resistor leads are water proofed and the resistor is placed in 1.0 kg of room temperature water ( T = 20 ° C ) . Current runs through the resistor for 20 minutes. Assuming all the electrical energy dissipated by the resistor is converted to heat, what is the final temperature of the water?
Electrical power generators are sometimes "load tested” by passing current through a large vat of water. A similar method can be used to test the heat output of a resistor. A R = 30 Ω resistor is connected to a 9.0-V battery and the resistor leads are water proofed and the resistor is placed in 1.0 kg of room temperature water ( T = 20 ° C ) . Current runs through the resistor for 20 minutes. Assuming all the electrical energy dissipated by the resistor is converted to heat, what is the final temperature of the water?
Electrical power generators are sometimes "load tested” by passing current through a large vat of water. A similar method can be used to test the heat output of a resistor. A R = 30
Ω
resistor is connected to a 9.0-V battery and the resistor leads are water proofed and the resistor is placed in 1.0 kg of room temperature water
(
T
=
20
°
C
)
. Current runs through the resistor for 20 minutes. Assuming all the electrical energy dissipated by the resistor is converted to heat, what is the final temperature of the water?
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 185 J185 J of thermal energy is generated by the resistor during 6.19 s6.19 s of operation while connected to a 12.0 V12.0 V battery, find the correct value of this resistance (and avoid a cold, cold fate).
A 1.30 m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0 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 16.6 A. You can ignore any thermal expansion of the rod.
(A) Find the resistivity for the material of the rod at 20∘C Express your answer with the appropriate units.
(B) Find the temperature coefficient of resistivity at 20∘C for the material of the rod. Express your answer in inverse degrees Celsius.
A spool of tungsten wire 200 m long and with a diameter of 0.360 mm is at 20.0°C. For tungsten, the resistivity is 5.60 ✕ 10−8 Ω · m and the temperature coefficient of resistivity is 4.50 ✕ 10−3 (°C)−1.
(a) What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.450 A?
V/m
(b) What is the electric power (in W) delivered to the spool while it carries a current of 0.450 A?
W
(c) What is the power (in W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 310°C?
W
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY