The formula you are looking for is W = A x V. Watts = Amps x Volts. These values should be on the nameplate of the fan.
That is not a true statement
There are zero watts in 220 volts. Watts are the product of amps x volts. To receive an answer, the amperage of the device has to be stated. This amperage multiplied by the stated voltage will give you the wattage of a device.
With a voltmeter Keep volt meter terminal on phase and neutral wire and it will show the exact volatage
Resistors could be used if you can find resistors with a high enough wattage rating to dissipate the heat that they will generate. Your best bet is to purchase a voltage adapter. The adapter is just a transformer that steps down the voltage from 220 to 110 volts. Locate on the hair dryer what the wattage draw is and then match the transformer (adaptor) to that wattage output.
The amperage a 220 volt well pump will pull depends on the wattage of the pump. You can calculate it by dividing the wattage by the voltage (220V) to get the amperage. For example, a 1 HP well pump typically pulls around 8-10 amps at 220 volts.
The current through a 220 volt 150 watt bulb is I = W/E = .68 amps. The resistance of that bulb is R = E/I = 324 ohms. The wattage used by the 220 volt bulb when 110 volts is applied W = E(sqd)/R = 37 watts. Half the voltage with the same resistance will quarter the wattage output.
either one could. it depends witch one you unscrew first.
Yes, you can but the wattage output rating of the heater will not be reached due to the lower applied voltage. For example if the heater is 5000 watts at 277 volts, the current is I = W/E 5000/277 = 18 amps. The resistance of the heater is R = W/I (squared) = 5000/18 x 18 (324) = 15.43 ohms. Applying 220 volts on the same heater whose resistance is 15.43 ohms results in this new heater wattage rating. W = E (squared)/R = 220 x 220 (48400)/15.43 = 3137 watts. W = watts, I = amperage, R = resistance in ohms and E = voltage.
Two wires are needed for 220 volts.
Does this air conditioner require 220 volts?
If the Peak to neutral voltage is 220 volts, the root mean square voltage is 155.6 volts (sqrt(220)).
220 volts, 110 volts, 440 volts, 400 volts, AC or DC voltage. High voltage like - 220 KV, 400 KV, etc