hi,
i have a device which is operating at 110Volts but i have power supply of 220Volts.
i wanna operate that device at 220Volts and i have an idea (which i still havn't try) of placing a resistance equal to internal resistance of device in series with power rating of 110Volts
if anyone of you have any other idea about this then tell me
thanks

 

A transformer would be a better option. Several are commercially available to allow American razors and hair dryers to work from European power sources.

The resistor would dissipate wasted energy as heat - using up an ammount identical to your device. Depending on how much power your device consumes, it could be difficult to find a suitably rated resistor. Example: If your device is a 500 watt hair dryer, then your resistor will need to be rated 4.5 ohms at 500 watts.

 

A transformer.
If it is a straight heating device, or a light, then "Chopping" the AC part way thru each cycle using a Triac and suitable driving circuitry may also work..(kinda like a light dimmer circuit). This is ONLY suitable for a purely heating or lighting circuit (like an iron, heater, lamp etc with NO electronic controls or motors).... ALL other appliances require a transformer.

 

I agree, You should use a transformer. This will give you a place to hook up your two hot wires and your 120 vac neutral. I can appreciate running at a higher voltage effectively cutting your amperage in half but most things like to run at designed voltages. -Jeff

 

I'm assuming, that like me, where 453 lives 220 - 240 volts IS the normal voltage, and this 110 v device is some sorta foreign import.

 

I think you are waisting your time, just get a step down transformer 220 to 110 with the at least about the same wattage as the equipment, and you'll be more safe on your equipment,.Myself i'm from europe and brought a keyboard musical instrument to USA that run on 220v so i had a transformer 220v 110, and just reversed the input to the output and i got myself a good set up, insteaded of trying to change the transformer inside the equipment.