# Expected power of a square wave

## 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

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Do you know equation of power for periodic waves?

No, Im not sure what that equation is... tried to look in my book but cannot find it.

$$\frac{1}{T}\int_{0}^{T}|x(t)|^2\,dt$$

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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