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You need one that can deliver not only the correct voltage but sufficient current to operate fully when under load. Check the current requirement on the sticker under the base, it will give operating voltage and watts. Purchase a transformer that matches the voltage and exceeds the watts by at least 30% so that the transformer is not operating at full capacity when under load. It will not matter if the transformer exceeds the watts by 100% or more but they do get bigger and heavier as the wattage goes up.
the wattage is on the plate attached to the drill and will still be the same as before you attach a step down transformer to get to the correct voltage
get a step down transformer that has a large wattage rating for 120 volts ( say 1200 watts ) as most 1/2 drills are 750 -1000 watts )
the wattage is for the rated current through the transformer and if the drill is of low wattage , it just gives the transformer a greater degree of serviceability in the duty cycle
Multiply the Voltage times the current to get wattage. The information plate on the unit will give you both numbers. In either case the MAX it would use would on a 15amp 120 Volt circuit would be 1800 watts. If its on a 20 amps circuit it would be 2400 watts. Unless its on a 220V circuit it would be one or the other. If its installed properly it should be on its own circuit breaker, see what size of circuit breaker its on and use the appropriate value. it could be less but it will not be more than these values.
Hello, if in canada you have 110V in europe you will have 220V so, you need to find out if next the plug of your devices you have a switch that you can change between 110V to 220V. That will help otherwise you can burn the device.
Volts, Amp Watts
To determine the wattage, use a simple multiplication formula. The ampere (or amps) is the amount of electricity used. Voltage measures the force or pressure of the electricity. The number of watts is equal to amps multiplied by volts.
The power supply isn't a transformer, its a switching power supply. The power supply is different for different locations, but you should not plug a 110V only power supply into a 220v source or vice-versa. You should contact iRobot if you wish to obtain the correct power supply for another location or to determine if they have an autosensing model that can sense and adapt to either 110v or 220v. You can also use a step down transformer to convert from 220v to 110v. The charger should be using 20W or less, but it will be pulling the current in narrow surges from the peaks of the voltage wave (aka a high 3rd harmomic current) and you will need to use a 40W or larger transformer to avoid unexpectedly overheating the transformer core.