How do you calculate total watts?

Steps

  1. The number of watts is equal to amps multiplied by volts. That's it! ...
  2. For example, if the current is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110, to get 330W (watts). The formula is P=3A X 110V = 330 W (with P standing for power).
  3. This is why watts are sometimes called volt-amps.

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