ring vs car

"Or maybe they couldn't afford to travel," I said. "Besides, how dangerous could it be?"
Bob stared at me for a second. Then he said, "You've been pouring energy into this thing every night for six months, Harry, and right now it's holding about three hundred times the amount of energy that kinetic ring you wear will contain."
I blinked. At full power, that ring could almost knock a car onto its side. Three hundred times that kind of energy translated to... well, something I'd rather not experience within the cramped confines of the lab. "It's got that much in it?"
"Yes, and you haven't tested it yet. If you've screwed up some of the harmonics, it could blow up in your face, worst-case scenario. Best case, you only blow out the project and set yourself back to ground zero."


Proven Guilty Chapter 6, Page 38