Comment Re:Will they need DC power to run more systems in (Score 2) 82
Grab a large car battery's terminals, one in each hand. You've now got a little over 12 volts potential across your body, from a battery that can easily deliver 200 amps. You know what you'll feel? Nothing. Not even if your hands are wet.
Now try the same with a 220VAC source current-limited to 10amps. Wet your hands and let the ER doc report on the results.
Don't do this ever. Use one wet hand to touch both post. You really will get hurt.
You ever drop a wrench on a car battery or bare frame to the 12+ and short the posts of a battery? Ya, instantly welds it to the post. With the human body its more about resistance and path it has to take. Up one arm across the chest and down the other. Too much resistance to really do much. Compare licking a 9v to just touching the posts. You have to press real hard to get conductivity with your hands. Either way its dangerous to short both. At least the 220 will have a breaker on it. Usually.