[Strategia_In_Ultima]

Look:

Shields must take awful lots of energy. That energy goes; where? I say it probably leaks off into space, causing the amount of power usage to increase... exponentially. But only if your shields are constantly activated. Therefore, it is "pulsed" on and off several (a lot of) times per second to prevent that big an energy leak. I mean, shields MUST leak energy... first law of thermodynamics anyone?