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Q4: The heater element of an electric kettle has a constant resistance of 120 n and the applied voltage is 220 V. Calculate the time taken to raise the temperature of one liter of water from 15°C to 90°C assuming that 78% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second liter of water through the same temperature range immediately after the first.

Q4: The heater element of an electric kettle has a constant resistance of 120 n and the applied voltage is 220 V. Calculate the time taken to raise the temperature of one liter of water from 15°C to 90°C assuming that 78% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second liter of water through the same temperature range immediately after the first.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter17: Electrochemistry And Its Applications
Section: Chapter Questions
Problem 83QRT
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Q4: The heater element of an electric kettle has a constant resistance of 120 Q and the applied voltage is 220 V. Calculate the time taken to raise the temperature of one liter of water from 15°C to 90°C assuming that 78% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second liter of water through the same temperature range immediately after the first.
Transcribed Image Text:Q4: The heater element of an electric kettle has a constant resistance of 120 Q and the applied voltage is 220 V. Calculate the time taken to raise the temperature of one liter of water from 15°C to 90°C assuming that 78% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second liter of water through the same temperature range immediately after the first.
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