An immersion heater used to boil water for a single cup of tea plugs into a 120 V outlet and is rated at 300 W. Suppose your super-size, super-insulated tea mug contains 400 g of water at a temperature of 13 oC. You can ignore the energy needed to raise the temperature of the mug and the heater itself. 1)What is the resistance of the heater?

An immersion heater used to boil water for a single cup of tea plugs into a 120 V outlet and is rated at 300 W. Suppose your super-size, super-insulated tea mug contains 400 g of water at a temperature of 13 oC. You can ignore the energy needed to raise the temperature of the mug and the heater itself. 1)What is the resistance of the heater?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 91CP: A student uses a 100.00-W, 115.00-V radiant heater to heat the student’s dorm room, dining the hours...

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?
If 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?
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?
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 student uses a 100.00-W, 115.00-V radiant heater to heat the student’s dorm room, dining the hours between sunset and sunrise, 6:00 p.m. to 7:00 a m. (a) What current does the heater operate at? (b) How many electrons move through the heater? (c) What is the resistance of the heater? (d) How much heat was added to the dorm room?
A water heater that is connected across the terminalstreet of a 15.0V power supply is able to heat 250ml of water from room temperature of 25 degree Celsius to boiling point of 45seconds . What is the resistance of the heater? The density of water is 1000kg/m3 and the specific heat capacity of water is 4200J/kg/degree Celsius.
An immersion heater used to boil water for a single cup of tea plugs into a 120 V outlet and is rated at 500 W . Suppose your super-size, super-insulated tea mug contains 400 g of water at a temperature of 18 ∘C. You can ignore the energy needed to raise the temperature of the mug and the heater itself. What is the resistance of the heater? How long will this heater take to bring the water to a boil?
A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.92 Ω. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.13 kg of coffee from 20.6°C to 46.2°C with this heater? Coffee has a specific heat of 4184 J (kg · °C) . Neglect any energy losses to the environment. min
Suppose that the resistance between the walls of a biological cell is 5.7 × 109 Ω. (a) What is the current when the potential difference between the walls is 83 mV? (b) If the current is composed of Na+ ions (q = +e), how many such ions flow in 0.66 s
A well-insulated electric water heater warms 107 kg of water from 20.0°C to 41.0°C in 29.0 min. Find the resistance (in Ω) of its heating element, which is connected across a 240 V potential difference. Ω (b) What If? How much additional time (in min) would it take the heater to raise the temperature of the water from 41.0°C to 100°C? min (c) What would be the total amount of time (in min) required to evaporate all of the water in the heater starting from 20.0°C? min
A 120 V potential difference is applied to a space heater whose resistance is 13.7 Ω when hot. At what rate is electrical energy being transferred to thermal energy? How much thermal energy is produced in 9.1 hours?
25) 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 0.300kcal/kg·°C, assuming no heat escapes? Please show all work using this. (Actual values, equations, and drawings)