What happens when you plug in a 220v appliance into 110v?
Keeping this in consideration, what happens if you plug a 110v appliance into a 220v outlet?
If the 110V appliance is connected to a 220V power supply, the power may quadruple at the moment the appliance switched on, and the appliance will quickly operate in an overvoltage condition. It may be accompanied by smoke and flash, or the fuse will melt and the protection part will be damaged.
In this manner, can I plug a 220v into 120v?
If a 220V appliance is plugged into 120V then it will be less dramatic but the power drawn will be 1/4th or the intended amount and the lights will be very dim and the motors will stall or turn very slowly. If they stall it may up the current some but in general it won't work well if at all.
"It is both an adapter and step-down converter" - by Grace S. As an adapter, it comes with the usual US, UK, Europe and AUST prongs. As a converter, it can convert 220V (Europe, China, etc) to 110v, not the other way around though. There is a switch to select the adapter or converter mode.