The heater element of an electric kettle has a constant resistance of 100 Ω and the applied voltage is 250 V. a.) Calculate the time taken by the kettle to boil one liter of water initially at 20ºC if all the electrical energy supplied is used in heating the water and the kettle . The water equivalent of the kettle is 100 g, b.) What percentage of the supplied electric energy is lost in heating the kettle? What percentage of the supplied energy is used in heating the water? c.) Assuming that only 85% of the electrical energy supplied is used in heating the water, determine the time it takes the kettle to boil 1 liter of water from 20o C.
The heater element of an electric kettle has a constant resistance of 100 Ω and the applied voltage is 250 V. a.) Calculate the time taken by the kettle to boil one liter of water initially at 20ºC if all the electrical energy supplied is used in heating the water and the kettle . The water equivalent of the kettle is 100 g, b.) What percentage of the supplied electric energy is lost in heating the kettle? What percentage of the supplied energy is used in heating the water? c.) Assuming that only 85% of the electrical energy supplied is used in heating the water, determine the time it takes the kettle to boil 1 liter of water from 20o C.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question
The heater element of an electric kettle has a constant resistance of 100 Ω
and the applied
voltage is 250 V.
a.) Calculate the time taken by the kettle to boil one liter of water initially at 20ºC if all the
electrical energy supplied is used in heating the water and the kettle . The water equivalent of
the kettle is 100 g,
b.) What percentage of the supplied electric energy is lost in heating the kettle? What percentage
of the supplied energy is used in heating the water?
c.) Assuming that only 85% of the electrical energy supplied is used in heating the water,
determine the time it takes the kettle to boil 1 liter of water from 20o
C.
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