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I have hard time answering one of my course problem.

The problem is Find the total power developed in the below circuit if v1 = 500 V and ig = 60 can some one explain how can I answer this problem. http://i.stack.imgur.com/abxbH.jpg

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closed as not a real question by Olin Lathrop, Nick Alexeev, Brian Carlton, Dave Tweed, Connor Wolf Nov 9 '12 at 0:02

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

Well what do you actually have a problem with? What did you try? Is there something you don't understand? –  AndrejaKo Sep 14 '12 at 9:50
We can help you work thru your homework problems, but we are not here just to do them for you. You should define all the variables you use, use proper sentences, make the image a reasonable size, show what you have already done to try to solve the problem, and explain exactly where you are stuck. In the mean time this question should be closed. –  Olin Lathrop Nov 7 '12 at 13:14

2 Answers 2

First you need to figure out what you really want to know. What do you mean by the word "developed"?

Using KCL and KVL you can determine all of the circuit voltages and currents by inspection, given the values of v1 and ig. Using the passive sign convention you can then calculate the power of each element. Add them up and you're done.

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It's easy! Many students are getting confused with such type of problems. Which is really very pity. In the question "developed" means a lot for those who don't know "tellegen's theorem". Yeah! Tellegen's theorem states that "power delivered by delivered elements is equal to the power dissipated in the absorbed elements". So, it is your duty to find these!

  1. Count all the sources (\$V\$ and \$I\$), resistances and dependent sources first.
  2. Classify them as "power absorbing elements" and "power delivering elements" by finding power across all the elements individually.
  3. Now add all the values of answers that comes under the category of "power delivering elements" which becomes total power developed. Remember the total value obtained by adding all the values of power absorbed will be same but opposite in sign with the value that occurred by adding all the values of power delivered.
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