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

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

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 9.6CYU: Check Your Understanding A strain gauge is an electrical device to measure strain, as shown below....

See similar textbooks

Similar questions

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. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg • °C, assuming no heat escapes?
What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103 V is applied to it? (Such a rod may be used to make nuclear- particle detectors, for example.)
An electronic device designed to operate at any temperature in the range from 10.0C to 55.0C contains pure carbon resistors. By what factor does their resistance increase over this range?
Check Your Understanding A strain gauge is an electrical device to measure strain, as shown below. It consists of a flexible, insulating backing that supports a conduction foil pattern. The resistance of the foil changes as the backing is stretched. How does the strain gauge resistance change? Is the strain gauge affected by temperature changes?
A typical cell phone consumes an average of about 1.00 W of electrical power and operates on 3.80 V. (a) What average current does the phone draw from its battery? (b) Calculate the energy stored in a fully charged battery if the phone requires charging after 5.00 hours of use.
A current of I= 25A is drawn from a 100-V batteryfor 30 seconds. By how much is the chemical energy reduced?
A 160F capacitor charged to 450 V is dischargedthrough a 31.2k resistor, (a) Find the time constant.(b)Calculate the temperature increase of the resistor, given that its mass is 2.50 g and its specific heat is 1.67kJ/kg °C,noting that most of the thermal energy is retained in the short time of the discharge, (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?
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. (a) What is the battery’s internal resistance? (b) What power is dissipatedinside the battery? (c) At what rate (in ºC/min ) will itstemperature increase if its mass is 20.0 kg and it has aspecific heat of 0.300 kcal/kg ⋅ ºC , assuming no heatescapes?
a) A1500W heater is connected to a 120V line. How many heat energy does it produce in 2.0hours? b) The resistivity of gold is 2.44x10-8ohm.m at room temperature. A gold wire that is 1.8mm in diameter and 11cm long carries a current of 170mA. How much power is dissipated in the wire?
A 500-W heating coil designed to operate from 110 V is made of Nichrome wire 0.500 mm in diameter. (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. (b) What If? Now consider the variation of resistivity with temperature. What power is delivered to the coil of part (a) when it is warmed to 1 200°C?
A length of aluminum wire has a resistance of 30.0 Ωat 20.0°C. When the wire is warmed in an oven and reaches thermal equilibrium, the resistance of the wire increases to46.2 Ω. (a) Neglecting thermal expansion, find the temperatureof the oven. (b) Qualitatively, how would thermal expansionbe expected to affect the answer?
A 17-V storage battery delivers current at the rate of 55 A. In a 26-min period, the heat lost from the battery is 108.71 kJ. What is the change in internal energy in kJ of the battery for the discharging period?