First, I'm sure this question is way too easy for this forum but I didn't find a better one. I'm having an argument on the following and we'd like to settle it officially.
On a website about Diesel-Electric cruise ships, we found the following:
The entire ship—not just its propulsion system—can function with only two of the four main generators on line. Each unit generates 11.5 MW at 6.6-kV alternating current. Two electric motors provide the ship's propulsion. The motors are synchronous and run to match the frequency of the supply current. Each motor consumes 14 MW with a voltage of 2.3 kV, so the system requires transformers, as the figure shows.
How is it possible for 2 * 11.5MW (23MW) to generate enough power to feed 2 * 14MW (28MW) motors? As far as my memory of physics goes, the P=UI law, in that case, only allow me to say that
23MW @ 6.6kV ==> 1.74kA and 23MW @ 2.3kV ==> 5kA
Is it possible to say from this that
23MW @ 6.6kV = 66MW @ 2.3kV
and if so, why?