1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Energy from a 60-watt bulb

  1. Dec 21, 2005 #1
    I'm not sure I'm doing this correctly...

    If all of the energy from a 60-watt bulb was put into 1 gram of water at room temperature for 2 seconds, how much would the temperature of the water increase?

    I tried it using the example but I wanted to check my answer first.

    60 * 2 = 120
    120 / 4.1868

    29 degrees Celsius?
     
  2. jcsd
  3. Dec 21, 2005 #2
    That's correct; nice work.

    Don't be afraid to show the formulae you use, though.
     
  4. Dec 21, 2005 #3
    Ah, that's good.:smile:

    Actually, I don't know the formula. I was using the example on this site here.
     
  5. Dec 21, 2005 #4
    [tex]P = \frac{\Delta E}{\Delta t} \Rightarrow \Delta E = P \Delta t[/tex]

    [tex]\Delta E = mc \Delta T[/tex]

    They're a little useless if you've never covered the concept, though, I suppose.
     
    Last edited: Dec 21, 2005
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Energy from a 60-watt bulb
Loading...