How much mah are running through the on-board network of our big ships?

Hello technician! Somewhere I could read how much milliampere resting current in our elks slumber – now I would be interested in how much it is, if the elks are awake or “under current”? After I have burned a walkman with power consumption 150mah over a power supply with 1000mah, I have become a bit careful about the things that I want to hang onto the board net. Specifically I mean the usual sockets or the light lines (reversible headlights). (Since I am a non-technician, I would like to see bad comments if I should have asked something “dumb” lG Richard