After reading "The Boy who Harnassed the WInd" this is a simple activity to do with students. I like to share a short video such as this: https://www.youtube.com/watch?v=xy9nj94xvKA and then let students work together to understand the parts of a wind turbine.
This poster shows students how to use a formula. First you plug in the numbers then you "chug out" the solution It uses the area of a trapezoid formula to do so.