I just checked mine in the kitchen. That one uses 1.4 amps at 120 volts, which is 168 watts. Others may be slightly more or less, but that is about average.
for a large one it is 4,000 watts and for a smaller one it is 1,000 watts
Garage door openers have a "starting watts" and "running watts" ratings. A 1/4 horsepower generally has a starting watts rating of 1,100 and running of 550 watts. A 1/2 horsepower opener uses 1,400 starting watts and 725 running watts. These are general ratings and to be more precise you would need to know the brand, model and other information on a specific opener.
Electric lights that use from 0.02 watts to 50,000 watts have been manufactured. The CFLs, fluorescent tubes, and incandescent bulbs in your house probably operate in the range of 20-100 watts.
To determine the number of watts of electric energy consumed by electric iron, we need to multiply the volts and the ampere used by that particular electric iron, so the product of those two is the watts used by the electric iron.
http://www.booneelectric.coop/coop/tips2.htm According to this webpage the average garage door opener is 800 watts and uses 6¢/hr worth of electricity (based on a 8 cents per kilowatt hour electric rate).
a fridge, freezer and an electric can opener
Garage door openers have a "starting watts" and "running watts" ratings. A 1/4 horsepower generally has a starting watts rating of 1,100 and running of 550 watts. A 1/2 horsepower opener uses 1,400 starting watts and 725 running watts. These are general ratings and to be more precise you would need to know the brand, model and other information on a specific opener.
Volts and watts are different quantities and their relationship also includes the electric current. Voltage times current in amps equals the power in watts use.
kinnetic
because their families want to use them like electric ones
To figure that out you need to know the Amperage that it draws and what the voltage of the circuit is that you're using. Once you know that you can figure out how many watts it uses by doing simple math. Voltage x Amperage = Watts
Look on the back of the equipment for a manufactures label. If the wattage is not on the label just use this equation Watts = Amps x Volts. This will give the wattage that the piano uses whenever it is turned on.