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Expected power of a square wave

  • Thread starter Tjvelcro
  • Start date
  • #1
18
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Homework Statement



What is the expected power of the first three frequency components of a square wave with an amplitude of 0.2V?

Homework Equations



None that I know of :(

The Attempt at a Solution



I'm not sure where to start with this since it seems to give me so little information. I think I may have to use V(rms) but I'm not sure. Any help or hints would be appeciated.

Tjvelcro
 

Answers and Replies

  • #2
378
2
Do you know equation of power for periodic waves?
 
  • #3
18
0
No, Im not sure what that equation is... tried to look in my book but cannot find it.
 
  • #4
378
2
[tex]
\frac{1}{T}\int_{0}^{T}|x(t)|^2\,dt
[/tex]

Above is the power equation.

However, it seems like you are attempting to finding power contained in first three frequency components of square wave. I only read the title thought you want power of square wave. I would suggest you to look into .. Parseval's Theorem (http://engnet.anu.edu.au/DEcourses/engn2228/Lectures/Lecture15.pdf slide 11).
 
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