This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If ... (Read 67 times)

ap345

  • Hero Member
  • *****
  • Posts: 537
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?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

emily12345

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jul 28, 2018
Answer to Question 1

83 cents

Answer to Question 2

50 MW


ap345

  • Member
  • Posts: 537
Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

brbarasa

  • Member
  • Posts: 308
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Water Molecules Surround Ions Water Molecules Surround Ions
The Pathways of Water and Solutes in a Plant. The Pathways of Water and Solutes in a Plant.
Hand Washing Using Soap and Water Hand Washing Using Soap and Water
Turn on water Turn on water
Xeriscaping Conserves Water Xeriscaping Conserves Water
Wetlands Store and Clean Water Wetlands Store and Clean Water
Video: Negative Feedback Regulation of Blood Pressure

For a complete list of videos, visit our video library