http://i289.photobucket.com/albums/ll220/XBrettX/thursdaysong-2-1.jpg
Here is part of a song I'm trying to play...I was wondering how many beats are really in this bar, and which chords are the beats. Are they 8th notes? I'm confused. And do I strum up and down on all of those or just down? I'm playing this with an electric.

Another question: do you ALWAYS use downstrums with power chords?