Well, I don't think it's really magic. But I think that actually makes more sense than any real explanation.

Apparently, this Transector used to be part of some giant space Decepticon. But it broke up into pieces, which crashed all over the Earth. Some ended up in Decepticon hands. But this one, I found it, and I joined the Autobots. We were looking for more, but I ended up here instead.

...The energy stuff's still true, though.