Watch the Roots to Branches online guitar lesson by Brad Carlton from Chord Studies: Power Chords Vol. 1
Here's a funky little groove in the key of E. We start off with an E5 on the middle four strings with a root, fifth, root voicing. We could shift this shape down to get our d5 but again we are trying to stay in position here. Go back to the E5 and then grab the G5 and you'll notice that all of the voicings here are arranged root, fifth, root.