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Homework Help: Heat input

  1. Sep 4, 2012 #1
    1. The problem statement, all variables and given/known data

    ==================== <---- aluminium plate
    ⁣⁣⁣⁣⁣⁢⁢⁢⁠⁡⁡⁢⁢⁢........O .....................O.......... <---- heat coil(O)

    Given an aluminium plate put on 2 heating coil(O), assuming no heat loss, how much is the heat transfer rate from the coil to the plate?

    Put the power of each coil as W.

    3. The attempt at a solution

    Series or parallel? Does the 2 power add up or it all ends up with just W?
  2. jcsd
  3. Sep 4, 2012 #2


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    Staff: Mentor

    Hi exec. Is this a question that you made up?

    If it's a question from a textbook, then I think you have abbreviated it too much; you have omitted some relevant details which we would otherwise have to make assumptions for. Can you post the complete question?

    Also, you should be able to explain your line of reasoning that leads you to think the answer might be W.
  4. Sep 5, 2012 #3


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    Science Advisor
    Homework Helper
    Gold Member

    What he said. More detail required.

    Meanwhile as written it's parallel so 2W.

    However watch out for problems where the power from each coil is specified as "X Watts per square meter". Doubling the number of coils AND the area doesn't change the power density. It would still be "X Watts per square meter".
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