It's not as common as "current" but nobody around here would think twice about another engineer saying "amperage" or "wattage", especially so in an AC power situation. The terms are also commonly used to expressing ratings, as opposed to measurements, as in "what's the amperage of that fuse?"
We also say that "current flows" which gets some people here upset.
And we say pulses per second, cycles per second, rep-rate, and all sorts of other non-Hertzian things. And mhos instead of Siemens sometimes.
This just isn't important; since we are engineers, we don't have to pretend to be engineers. The only thing that's incorrect in engineering is gadgets that don't work.
John