We've now learned about how circuit boards have small things called resistors on them.
Another thing you may find on a circuit board is a capacitor.
It's kind of like a bucket that fills up with electricity, then dumps it out, over and over.
(from: wikipedia - capacitor)
You have to be very careful with capacitors on circuit boards!
Even if you are looking at one that's not plugged in,
the capacitor can still be filled up with electricity and it could zap you!
