Wheatstone Bridge - Max power delivered

  • #1
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Homework Statement


attachment.php?attachmentid=33119&stc=1&d=1300218210.jpg



The Attempt at a Solution



I was able to find the net resistance as its a balanced wheat stone bridge ...

But how to find R for max power delivered?
 

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Answers and Replies

  • #2
Delphi51
Homework Helper
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You need an expression for the power delivered to the load (not counting power lost in the 4 ohm resistance of the battery). I suggest you begin by calling the resistance of the network Z. Then the current through Z is I = V/(Z+4). The power delivered to it is P = I²/Z.
That function of Z will vary with Z and have a maximum for some specific value of Z. You could use the derivative method to find that value.
 

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