some kinds of microwaves
If the appliance tells you how many watts it's supposed to use you can buy a watt-meter to measure how many watts the appliance is using buy plugging in the meter into the wall and then plugging the appliance into the meter. A popular brand is "Kill A Watt", it meter can be bought on E-bay for under $25.
Yes, the adaptor can supply anything from zero up to 90 watts.
The amount of watts AVAILABLE to an appliance is not so significant as long as there are ENOUGH watts. Three things are important when determining what U.S. appliances can be used in Europe with converters: 1. Voltage. Most U.S. appliances operate on 110 volts. Your converter must be capable of delivering 110 volts to your appliance. 2. Current. Volts X Amps = Watts. It's a simple formula but it will determine whether your appliance will operate on a converter or just be frustrating. While volts is the "potential", Watts is a measurement of energy. It can be the energy the appliance uses or the energy that the converter delivers. If the appliance uses 200 Watts a 100 Watt converter will not work, either the appliance or the converter will fail. 3. HZ. While most appliances are not so fussy, some devices require that the electrical source be 60 HZ. Europe is 50 HZ and as such will cause some problems with appliances that require 60 HZ. FYI, HZ is the number of times per second that an electrical source reverses voltage. Commercial power is delivered as "alternating current", since that is the only way transformers can function. Europe has a different standard so make sure your appliance will operate on 50 HZ before you take it all the way over there. If the appliance does not list the energy used in Watts, it should be there in Amps, so you can use the formula above to figure out the Watts that you need. Good luck, and have a nice time in Europe.
1440 Watts
current=watts(power)/voltage
Amps * Volts = Watts. 50 Watts at 120 Volts = .4 Amps 50 Watts at 12 Volts = almost 4.25 Amps 50 Watts at 1 Volt = 50 Amps
It would cost $2.24 in electricity to run the computer 50 hours in a week.
1840
50 watts for a small one, 200 watts for a big one. The voltage is 230 v in Europe, 120 v in USA.
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The voltage isn't a problem, you can run 220 from your house and use that to run a European appliance, the problem is whether the appliance is dependant on line HZ. European is 50HZ and US is 60HZ. If the appliance specifies 220/50HZ, it will probably give you trouble here. If it says 220V/50 or 60HZ
You need to know the volts of the device to answer the question, if it's a household appliance (120v) then the answer is 36 watts, if it's an automobile device (12v) then the answer is 3.6 watts