Approximate Power Values
E-Ranks are usually 1-8
D-Ranks are usually 9-15
C-Ranks are usually 16-25
B-Ranks are usually 26-40
A-Ranks are usually 41-70
S-Ranks are usually 71-100
X-Ranks are usually 101-120

Note: This is mainly pure power. So if there's an increased Accuracy Value thing, power would be higher. Oh, and remember, burns are actually weaker then power since the power value can be increased and stuff with a good post and stats.

Katon: +5 Power Value on top of what you give it
Raiton: +2 Power Value on top of what you give it