Each equipment has electrical specifications; for example most laptop chargers are rated to handle 110V to 240V at either 50-60Hz. In other Words; the charger can be plugged into either 110V or 240V and it will adjust automatically and keeps the output at the voltage the computer requires.
Some desktops have an option on the power supply to accept either voltage, which must be set manually.
However; much of the electrical equipments are set to a single voltage and it can not be changed. should someone plug in a 110V rated equipment into a higher voltage (i.e. 240) then the internal parts will burn.
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