The table below summarises the plug types, voltage and frequency of electrical current in both Czech Republic and Tonga.
| Czech Republic | Tonga | |
|---|---|---|
| Plug Types | E | I |
| Voltage | 230V | 240V |
| Frequency of electrical current | 50Hz | 50Hz |
Czech Republic uses Plug Type E.
You will need this adaptor:
Socket Type
(Czech Republic) to Plug Type I
(Tonga)
The voltages found in Czech Republic (230V) and Tonga (240V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Czech Republic and Tonga is exactly the same (50Hz). Timing devices and appliances that use motors will function as expected under this frequency.