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All domestic appliances have a rating plate which informs you of the voltage, wattage and energy rating. Its the wattage that will give you a rough theoretical idea of the power but in reality it only applies to the power consumption of the item not its actual sucking/pick-up rate.
Volts is best thought of as the "speed" at which electricity is traveling. Wattage on the other hand is a measure of how much electricity is consumed over a certain length of time. This is why the wattage is listed on light bulbs, because it involves power consumption and your electricity bill. Volts on the other hand are a requirement for compatibility with various devices. If you plug a 110v device into a 240v power supply you're going to have a bad time. Many high tech electrical devices these days have on board transformers and will accept a wide range of voltages.
You're not going to be able to do this with just a known Horse Power.
There are 3 elements to the equation, with any two, you can work out the third.
If you want to know how the amperage, you will need to know the voltage and wattage of the motor. I imagine that you already know the voltage (It's going to be 220V or 110 volt)
Watts divided by volts = Amps
A 220v 1000 watt motor (1000 divided by 220) will draw 4.55 amps A 110v 800 watt motor (800 divided by 110) will draw 7.27 amps
Bear in mind that most washing machines have a couple of windings for wash and spin. As an average, the was winding will usually be about 500 watts to spin and about 250 watts to wash. ALSO, bear in mind that if you are using this data for a WASHING MACHINE, then there is a water heating element in there too and that draws about 2Kw (2000 watts)
Dont just take this as read, you DO need to check wattages, but, working on what I have just said, the max consumption on a 220V machine will look like this:
At Spin, with a 500 Watt consumption: (500/220) = 2.3 amps While Washing with a 250 watt consumption: (250/220) = 1.14 amps
Consider that the WASH and HEAT may be running at the same time. 2Kw heating (2000/220) = 9.1 amps PLUS 1.14 amps for the motor - Total wattage 10.24 amps
Watts / Volts = Amps Amps x Volts = Watts Watts divided by amps = Volts
I'm disappointed that Dewalt does not have the full specs on their website so . . .
Check the specifications on the charger's label; they should read something like 120 VAC or Volts AC and 2.0 (or similar) amperes or just 'A' after a numerical value.
If the label does not give you an amperage value you can use the output value instead and substitute the output voltage at the high end if a range is listed.
To get the adaptor (step-down transformer) wattage, multiply the AC values such as:
120 X 2=240 watts input power.
If these AC values are not available;
Take the high end charge voltage if it is a multirange charger, and multiply those values;
One we own DW9108 (- yours is 7.2 - 18) is spec'd at 9.6 to 18 volts and 2.8 amperes:
2.8 X 18=50.4 watts.
You can see that the values do not correspond but it is a multirange device so the maximum current taken from the AC line can be ~ 2.0 amperes but this is charging a specific pack and the peak input current is only momentary so the maximum output current and voltage are the values one should use as a guide.
In other words, the output wattage is closer to the value needed.
Since there are losses in any transformation (mostly heat), the required stepdown transformer must be capable of more than the indicated 50 watts.
A safe factor would be 1.5 X 50 (W) or ~ 75 watts minimum to ensure the charger receives the 120 volts it wants.
Anything that will step down your (?) 220 volts and is rated at 75 watts or more will do the job even if the Dewalt draws a little more current at your line frequency of 50Hz which it may.