C Power Chord (5) (C5)
1+5
Notes in C Power Chord (5)
C (root)G
Inversions
Same notes as C Power Chord (5), with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
C in the bass
1st inversion
G in the bass (C5/G)
The notes C and G make up C Power Chord (5).
Just a root and a fifth, no third at all. That makes it neither major nor minor, which is why rock guitar and simple piano left-hand parts lean on it so much. It sounds strong and neutral, and it leaves room for a singer or another instrument to decide the mood.