i'm not sure if this is the place to ask this, so let me know if i'm in the wrong section. I'm starting a class tomorrow where we're going to be researching how different components of a satellite work. our professor wants us to know what we learned in Electromagnetism and Waves, primarily things like Ohm's law and how a basic circuit works. i've been out of physics for about a year, so I was wondering what would be a good reference guide for those topics? or should i just check out a textbook?