Maurice Tutor

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Category > Management Posted 21 Mar 2018 My Price 6.00

electric-resistance heating element

A 52-gallon electric water heater is designed to deliver 4800 W to an electric-resistance heating element in the tank when it is supplied with 240 V (it doesn’t matter if this is ac or dc).

a. What is the resistance of the heating element?

b. How many watts would be delivered if the element is supplied with 208 V instead of 240 V?

c. Neglecting any losses from the tank, how long would it take for 4800 W to heat the 52 gallons of water from 60° F to 120° F? The conversion between kilowatts of electricity and Btu/hr of heat is given by 3412 Btu/hr = 1 kW. Also, one Btu heats 1 lb of water by 1° F and 1 gallon of water weighs 8.34 lbs.

 

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Maurice Tutor
(5)
Status NEW Posted 21 Mar 2018 03:03 AM My Price 6.00

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