Anyone here good with electrics?

1 KWH is one unit on your bill, so about 15p

So if the OP was to use the full 500watts of this power supply for a full hour it would cost him 7.5p. So unless your event is going to last about 1053 hours you may be being slighty ripped offski.
 
Multiplying isn't significant maths;):D. What I'm saying is if he can only have 1 item per socket, he needs to check things like the Wii and stuff, to make sure he doesn't just get a load of 2 amp sockets, then find he can't run some of his stuff.

8 items = 8 plugs with an individual load limits of 500w.

I could run my 40" TV and an Xbox off just one of those plugs.
 
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