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Okay. So you've learned the Pentatonic Scale and some exercises or either you don't see the point in learning scales. Well, you know those guys who can rip up an axe by improvisation? Or someone who is very melodic with the guitar? They understand where the notes are all over the neck. They know scales and the tonics within the scale shapes. They know how to identify keys and play in key. Thus, knowing where the notes are all over the neck and knowing where tonics are located within scale shapes--and knowing how to play in key--you can rip up an axe and play strong melodies.
If you do not know how to play in the key of G or Em, you might want to check out my lesson called "Playing In Key," David O' Toole's lesson "Essential Chord Families," or fish through Charles Gacsi's many theory lessons.
To play in the key of G, you can play the chords:
G, D, C, Em, Bm, Am
You can play the same chords for the key of Em.
Visit those lessons for an explanation or proceed.
With power chords you can be more clumsy, as they are only two note chords--diads--lacking the note that makes them major or minor chords.
So, if you wanted to play in the key of G5, here is a method for figuring out chords.
Play the G Major Scale. Take each degree and make them the root of a power chord.
The notes of the G Major Scale are G, A, B, C, D, E, F#. Excluding the last degree, F#, we come up with: