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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
    x*7=1272/1800
    x=1.28

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

    gneill

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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

    SammyS

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    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    If R=7Ω , then this is correct !
     
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