rlogiacco:
Sorry for the bother Mike, but why are you suggesting a FET with a 10A rating for a 1A load? I mean, shouldn't a 20W One be enough?
Because of the requirement for a "logic level" FET.
Eh?
A "logic level" FET will turn on at logic levels, but not fully. It really needs about 8 to 10 volts, so you need to under-rate a heavier device to get it to switch on sufficiently for your load.