Generator, provides W = J/s = N*d/s
Engines, output has a max horsepower output. 1/2 mv^2 = W*dt + 1/2 m v^2
1 electrical motor hp = 746 W
Railgun, charges at J/s with a maximum capacity.
Radar, quadruple power to double range
1 MW generator, 1000 hp engine, 1 MJ railgun