Not to be confused with a power transformer, which only change the plug, the active components of the transformer are the voltage converters, which step the voltage down from 220-240 volts to a safe 120 volts. If you have to use a device in Asia that is not rated for 220 volts, you will need a voltage converter.
Let's Get It Fixed!
HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.