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Author Question: The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If ... (Read 63 times)

ap345

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on: Jul 28, 2018
The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg of water in the tank from 15C to 80C? (The specific heat of water is 4 186 J/kgC)

Question 2

A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles. If the resistance per length in the wire is 0.5 W/mile, what is the power loss due to resistive losses?


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emily12345

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Reply #1 on: Jul 28, 2018
Answer to Question 1

83 cents

Answer to Question 2

50 MW


ap345

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Reply 2 on: Jul 28, 2018
YES! Correct, THANKS for helping me on my review

bblaney

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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