Australian power is 230 Volts and 50 Hz. A medium sized plug is used that looks like you took a three prong US / Canadian plug and bent two of the flat blades of the plug out...as per below. The wall plugs are also always switched like you see in England.
This is not a voltage change if you are coming from most of the world with 220-240Volt power. In that case you either use a plug adapter (see a paragraph below) or cut the plugs...
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