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Size some transformers in watts or kilowatts.transformer image by palms from Fotolia.com
Size the transformer in amps. Smaller transformers used in chargers and appliances are often sized in amps or milliamps (meaning thousandths of an amp). For example, 50 milliamps means .05 amps or 50 thousandths of an amp. Determine the current your circuit or appliance will need, and size your transformer at or above the amperage level you determine. - 2
Size some transformers in KVA.High Voltage Transformer image by Andrzej Thiel from Fotolia.com
Size the transformer in watts. Medium sized to large transformers are often sized in watts or kilowatts, meaning thousands of watts. The load means the total number of appliances your transformer will operate. For example, if you are traveling out of the US and have a transformer to change 240 volts to 120 for your computer, size the transformer at or above the wattage rating of your computer. For more than one appliance, size the transformer by adding up the watts of all the appliances you will use. - 3). Size the transformer in volt/amps. Larger industrial transformers are sometimes rated in volt/amps (VA). This really means the same as watts, because watts equal volts times amps. Use the terms watts and VA interchangeably. Add up all the power for the equipment you will power with the transformer. Size your transformer at or above the total.
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