Module 4 Heating Effect of Electric Current How long will it take to raise the temperature of 880 gm of water from 16ºC to boiling point ? The heater takes 2 amperes at 220 V and its efficiency is 90%. a. 11.26 min c. 13.08 min b. 12.56 min d. 14.05 min

Module 4 Heating Effect of Electric Current How long will it take to raise the temperature of 880 gm of water from 16ºC to boiling point ? The heater takes 2 amperes at 220 V and its efficiency is 90%. a. 11.26 min c. 13.08 min b. 12.56 min d. 14.05 min

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

Chapter43: Air Source Heat Pumps

Section: Chapter Questions

Problem 13RQ: Can a heat pump switch from heating to cooling and from cooling to heating automatically?

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Module 4 Heating Effect of Electric Current
How long will it take to raise the temperature of 880 gm of water from 16ºC to
boiling point ? The heater takes 2 amperes at 220 V and its efficiency is 90%.
a.
11.26 min
c.
13.08 min

b.
12.56 min
d.
14.05 min

____ 13. 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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