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Homework Help: Number of Resistors needed for a maximum power

  1. Feb 3, 2012 #1
    1. The problem statement, all variables and given/known data
    How many resistors, R = 70 ohms can be connected in a series circuit when the maximum power loss of the circuit is 1800W. and the voltages supply is 127V

    2. Relevant equations
    Number of resistors!

    3. The attempt at a solution
    P = V2 / x*R

    so only one resistor can be connected.
  2. jcsd
  3. Feb 3, 2012 #2


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    Staff: Mentor

    Are the resistors 7 Ω or 70 Ω? Your problem statement says 70, but you've used 7 in your calculation.
  4. Feb 3, 2012 #3
    no it's 7 Ohms. sorry for the typing mistake.
  5. Feb 3, 2012 #4


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    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    If R=7Ω , then this is correct !
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