You have bought simple plug adaptors, not voltage converters. China and Australia run on the same voltage- you might want to check these things if you ever plan a trip to the US or Japan.
As far as I know, plugging in simple 220-240V stuff like kettles or hair driers into 110V results in the device working in a half-assed fashion. I have no idea what happens if you plug 220-240 electronics (TVs) into 110V though.
And if you plug 110V devices into 220-240V, you can expect the device to fry almost instantly.
As I found out when I plugged a brand new Panasonic rice cooker into a travel plug and stuck it into the mains at my Mum & Dad's back at Christmas. At least it made my Dad laugh (not a great rice fan at the best of times) which was worth the 70 quid in itself.
Last edited by Makkun70; 22-04-2010 at 02:34 PM.