A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

How many Joules of energy are required to run a 100W light bulb for one day? Burning coal yields about 30 x 10^6 J of energy per kilogram of coal burned. Assuming that the coal power plant is 30% efficient, how much coal has to be burned to light that light bulb for one day?

  • This Question is Closed
  1. JamesJ
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Nice. You there?

  2. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes, I'm here....

  3. JamesJ
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ok. By definition power = change in work/energy over time. P = W/t Hence, how much energy does the bulb consume in one day?

  4. JamesJ
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Work, W = (Power)*(Time) or Energy, E = (Power)*(Time) hence how much energy does the bulb consume?

  5. JamesJ
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Watts = Joules/second. The light bulb is rated as a 100 Watt bulb.

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Hi James, sorry I went offline, but thanks so much for your great help! Much appreciated!

  7. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.