Watch the B in the Bass online guitar lesson by Brad Carlton from Chord Studies: Power Slash Chords Vol. 1
In this example, we have a constant B note in the bass and are moving intervals to form power chords around it. You start with an A5/B and then you simply move the double stops through the Bm pentatonic scale. You may be thinking that these chords have other names, and that's correct, but throughout this course we want to visualize these as power chords over a bass note.