lost my original 7A cable and the uk wire is 2.5A
The PS3 Slim's power supply is rated at 250W which works out to be just under 2.5A @ 110v. Since the PS3 only draws around 100W it should be OK. If you were using an Older PS3 then it would require more power and would not be safe with a 2.5A cable. Since a new cable wouldn't cost much you should probably invest in a better one anyway.
The slim is a two prong power cable however the fat one has a three prong.
