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Homework Help: Maximum power of resistor

  1. Nov 6, 2009 #1
    1. The problem statement, all variables and given/known data

    (a) For the circuit below, the value of R is adjusted so that each of the two 10Ω resistors dissipates 10W. Calculate the value of the variable resistor R.

    (b) What is the value of R if it is adjusted to dissipate the maximum power possible? For this value of R, determine the current through the resistor R and through each of the parallel 10Ω resistors.

    2. Relevant equations

    3. The attempt at a solution

    I've done part (a) and found the value of R to be 2.5ohms. i have no idea how to do part (b). can anyone help?!?!?!

    Thank you!

    Attached Files:

  2. jcsd
  3. Nov 6, 2009 #2
    If you know what R is, what is the power dissipated in this resistor? (as a function of R)
    do you know any method for finding the maximum value of a function?
  4. Nov 6, 2009 #3
    i have no idea! im new to this stuff! do u know?

  5. Nov 7, 2009 #4
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