Watch the Second Finger Stretch online guitar lesson by Brad Carlton from Chord Studies: Power Chords Vol. 1
This progression is a I - IV in the key of B. As in the last lesson our chords share a common tone. In this case the open B is the root of the B5 and the fifth of the E5. For fingering you are going play your typical power chord shape, but then reach back to get the notes on string one with your second finger. Make sure to watch your intonation with this one!