I wanted to know so badly: I'm learning about fuel injection now. I guess I know more about my weed-wacker now, too (We only use carburetors for small engines, now).
It's kind of fun that the first automotive fuel injectors were just an electronic version of a carburetor: it would just squirt some fuel in by the throttle body instead of the more modern multiport injection further up the manifold or high-pressure piezo injectors directly into the cylinder.