The table below summarises the plug types, voltage and frequency of electrical current in both Australia and French Guiana.
|Plug Types||I||C, D, E|
|Frequency of electrical current||50Hz||50Hz|
Australia uses Plug Type I.
In French Guiana there's more than one socket type in use. You may require more than one adaptor.
The voltages found in Australia (230V) and French Guiana (220V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Australia and French Guiana is exactly the same (50Hz). Timing devices and appliances that use motors will function as expected under this frequency.