How do I figure out how many Watts voltage transformer do I need?

You need to check how many Watts your appliance operates on (You can find this information on a label on the bottom or back of your equipment, or in the manual). If you can't find this information, you can try to find information on amperage (AMPS) of your appliance and multiply it by input voltage (110V or 220V) to arrive at the total wattage. Volts x Amps = Watts (i.e 110V x 0.5 AMPS = 55W).

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