What its the best way to transform AC do DC without a transformer=?iso-8859-1?Q?=3F_=96_electronics.stackexchange.com?=

What its the best way to transform AC do DC without a transformer? –
electronics.stackexchange.com

I have a battery drill, but the battery is useless, so I want to power
direct from the outlet. I need convert 220VAC to 7.2VDC @ 4A. I can't use
a transformer because the high output current, it ...