Tìm phần mềm máy tính trực tuyến. Kiểm tra thiết bị.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
There are many resources online that use calculators to determine watts. They will do the formula for you.  Such resources typically ask you to enter the number of volts, and the number of amps. Then you are asked to hit the “calculate” button to get the watts. Keep in mind, though, that online calculators aren’t always accurate because every appliance is going to be slightly different in its power needs. Some online sites will give you the watts needed if you click on the appliance type, such a