The table below summarises the plug types, voltage and frequency of electrical current in both Bahrain and Madeira.
|Plug Types||G||C, F|
|Frequency of electrical current||50Hz||50Hz|
Bahrain uses Plug Type G.
The voltages found in Bahrain (230V) and Madeira (220V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Bahrain and Madeira is exactly the same (50Hz). Timing devices and appliances that use motors will function as expected under this frequency.