Earlier this year Minute Physics released a video explanation of how light bulbs work. I shared that video along with some other resources for teaching about electricity in this post. Brain Stuff recently released a video that offers a good explanation of why we hear a buzzing sound coming from fluorescent lights found in many schools and office buildings. The video is embedded below.

Applications for Education
Why Do Fluorescent Lights Make That Buzzing Noise? could be useful in helping connect a lesson on electricity to an experience that most of your students share, hearing that buzzing sound in your classroom. Have your students create a list of possible causes of the buzzing sound before they watch the video to see if their hypotheses are correct.