A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.42 0. HINT Apply the expression for electrical power, remembering the energy required to heat the coffee is Q = mcAT. Click the hint button again to remove this hint. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.33 kg of coffee from 21.1°C to 48.2°C with this heater? Coffee has a specific J heat of 4184 Neglect any energy losses to the environment. (kg. °C) min

A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.42 0. HINT Apply the expression for electrical power, remembering the energy required to heat the coffee is Q = mcAT. Click the hint button again to remove this hint. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.33 kg of coffee from 21.1°C to 48.2°C with this heater? Coffee has a specific J heat of 4184 Neglect any energy losses to the environment. (kg. °C) min

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 41P: Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that...

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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?
Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.
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