An electric kettle is required to raise the temperature of 2 kg of water from 20ºC to 100ºC in 15 minutes. Calculate the resistance of the heating element if the kettle is to be used on a 240 volts supply. Assume the efficiency of the kettle to be 80%. a. 72 ohms c. 83 ohms b. 62 ohms d. 93 ohms

An electric kettle is required to raise the temperature of 2 kg of water from 20ºC to 100ºC in 15 minutes. Calculate the resistance of the heating element if the kettle is to be used on a 240 volts supply. Assume the efficiency of the kettle to be 80%. a. 72 ohms c. 83 ohms b. 62 ohms d. 93 ohms

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter33: Hydronic Heat

Section: Chapter Questions

Problem 23RQ: What is the heat output, in Btu/h, of a terminal unit with a T of 10F and a water flow rate of 5...

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Question

An electric kettle is required to raise the temperature of 2 kg of water from 20ºC
to 100ºC in 15 minutes. Calculate the resistance of the heating element if the kettle is to be used on a 240 volts supply. Assume the efficiency of the kettle to be 80%.
a.
72 ohms
c.
83 ohms

b.
62 ohms
d.
93 ohms

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