Expected power of a square wave

[Tjvelcro]

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

 

[rootX]

Do you know equation of power for periodic waves?

 

[Tjvelcro]

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

 

[rootX]

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

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).