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Homework Help: Electric Circuit

  1. Apr 25, 2009 #1
    1. The problem statement, all variables and given/known data

    Entrance exam question:
    An electric radiator which is an ordinary constant resistor emits a heating power of 750 W at a main supply voltage of 230 V. What is the total heating power in each respective instance when two such radiators are connected a) parallel, and b) in series to the 230 V supply voltage?

    2. Relevant equations

    P = VI = I square R = V square divided by R

    3. The attempt at a solution

    For me, question is unclear!

    Edit: is it 1500 W at parallel and 750 W at series? e.g. 115 x 3.2609 = 375 each in series, in parallel 230 x 3.2609 = 750 each?
    Last edited: Apr 25, 2009
  2. jcsd
  3. Apr 25, 2009 #2


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    Homework Helper


    P = VI

    and V is constant. So if I is double, power is double, etc.
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