Visualizing EM Waves: Learn Basics in 9 Days

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ElijahRockers
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Perhaps this is going in the wrong forum, but the Math and Science Learning Materials forum would not let me create a new topic.

I am not necessarily worrying about a specific question; in fact I am able to use the equations and formulas relevant to electromagnetic waves in my physics course quite fluently, especially considering that I'm not quite sure I even understand what/how they are.

I am having trouble 'visualizing' an electromagnetic wave, particularly the propagation of energy, and what kind of voodoo is really going on there... I have looked through my teacher's notes. They aren't the most comprehensible of notes. I scoured the Learning materials forums as well, and for all my searching I could not find a decent, dumbed down video or PDF to explain, in laymen terms, what an electromagnetic wave is.

If anyone has any suggestions of how I could clarify this material so that when test time comes (in 9 days), I have an understanding of the most basic concepts, it would be greatly appreciated.