What happens if an appliance that applies to 220v is plugged into a 110v power supply, and what happens if in turn a 110v appliance is plugged into a 220v power supply?

AC rated voltage 220V appliances mistakenly plugged into the AC/110v, is that the bulb will be less bright, power reduction. On the contrary, it will burn or explode! In summary: our electrical equipment, generally AC/220V. power supply is the same: 220V.

AC/110V appliances plugged into AC/220V 80% will burn out, you said the two uses, basically is a violation of the operation!