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Depends on the appliance, and in most cases, it does not matter. For a purely resistive appliance, such as a kettle, or a toaster, the two should be the same. Certain devices such as computers and other electronics will consume reactive power, which is measured by the VA rating. The Watt rating measures only real power. In residential settings, you will not be billed for reactive power, and so you do not need to worry about the VA rating. However, the VA rating is the "true" power required by the device, so if you are planning to hook it up to a generator or UPS, you will need to be able to provide at least that much power.

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Q: What is the difference between va and watt rating of an electrical appliance?
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