#1
Hey, I am re-learning to play guitar, and I was wondering...if I play the e-minor chord shape as a power chord...do I just play the top three strings? Do I even sound the top E string? Thanks for your help!
#3
This man speaks the truth. The same goes for any "power chord". For example a G5 (5 for 5th interval) or G power chord is:

-----
-----
-----
--5--
--5--
--3--

You can fret the rest of the bar chord for major or minor accordingly (I often do, it's good practice) but those are the only notes that should be/need to be sounded.
#5
no, you can play them:
--2--
--2--
--0--
this is an E5, E power chord
The second one, I forget Dang it
#6
Quote by Megadeth77
The second one, I forget Dang it
It's a B and E diad; the notes are a perfect fourth apart. In the right context, it could be considered an inverted powerchord, however.

A powerchord is a note and a note a perfect fifth above it. You can add on as many extra roots (octaves) and fifths, and in the right context, even have the fifth be the lowest note.
#7
I am a bit confused.

This is the one I can play:

--2--
--2--
--0--

yes?
Thanks for your help by the way.
#10
Oh wait, but you keep strings G, B and high E muted when you play this chord?