The table below summarises the plug types, voltage and frequency of electrical current in both Cook Islands and Sri Lanka.
| Cook Islands | Sri Lanka | |
|---|---|---|
| Plug Types | I | D, M, G |
| Voltage | 240V | 230V |
| Frequency of electrical current | 50Hz | 50Hz |
Cook Islands uses Plug Type I.
In Sri Lanka there's more than one socket type in use. You may require more than one adaptor.
Socket Type I
(Cook Islands) to Plug Type D
(Sri Lanka)
Socket Type I
(Cook Islands) to Plug Type M
(Sri Lanka)
Socket Type I
(Cook Islands) to Plug Type G
(Sri Lanka)
The voltages found in Cook Islands (240V) and Sri Lanka (230V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Cook Islands and Sri Lanka is exactly the same (50Hz). Timing devices and appliances that use motors will function as expected under this frequency.