Plug types & voltage by country

No. An adapter only reshapes the plug so it fits the socket — it does not change voltage. A converter/transformer changes voltage; without one, a mismatched appliance still won't work properly.

Check the INPUT line on the device or its power brick: "100–240V" means it works worldwide; a single rating like "220V" or "110V" only works near that voltage. Phone, laptop and camera chargers are almost always wide-voltage.

Usually not. Japan is 100 V and the US/Canada 120 V, but nearly all phone chargers support 100–240 V — if the plug fits, it charges (maybe slightly slower). Avoid packing single-voltage heating appliances like hairdryers.

No. Both are called Type I, but Chinese and Australian plugs are mirror images of each other (the earth pin is on opposite sides) and do not fit each other's sockets.

Yes — pick one with safety shutters and proper certification, and check it covers your destination: Type G (UK), M/N (South Africa) and N (Brazil) are often missing from cheap models. Note universal adapters never convert voltage.

Not for chargers and electronics — nearly all accept 50/60 Hz. Old motorised or timing devices (fans, mechanical clocks) may run at the wrong speed. For travel, plugs and voltage are what matter.