Here is what you need to do. First, check the label on your electronic device, it will give you a few pieces of information:
1. Voltage (might be a single number or a range, example : 110V or 110V- 220V)
2. Wattage (It will be a number followed by a W, mW, or kW, although, I don't think anyone here will have a device that's rated in kW)
3. Amperage (This might be given instead of number 2, Wattage, this will be a number followed by A or mA, you definitely will NOT see kA unless you are working with power-plant level stuff, in that case, you shouldn't be reading this guide from me).
All devices should have at least #1, and maybe 2 or 3, or maybe all 3 pieces of information.
Now, first step you need to do is, you will need to make sure the Voltage in the country you are in either matches the Voltage number of your device, or falls into the range. If it does not, then you will need a converter that converts the voltage. If it falls inside the range or matches, you are done, you just need to make sure the plug type fits.
If you are still reading, that means the voltage in the country you are in falls outside the range of your device. In this case, you will need a converter that changes the voltage. You will definitely need a converter that outputs a voltage that matches your device. However, that is not the only concern.
You also need to make sure the converter can handle the amount of power that your device will pull, otherwise, it will either blow a fuse, or burn up and catch on fire. You DON"T want that to happen.
So how do we determine if a converter is powerful enough? We look at the numbers 2 and 3 we mentioned before:
Wattage is a measure of the power draw of the device (power = energy per time). You will need a converter that is rated at an output wattage that is the same or higher than that of your device. To be safer, you can get one that is higher instead of exactly the same (you might even get away with slightly lower, but you risk blown fuse or electrical fire as mentioned before).
So, if the converter has an output rating in terms of wattage, you just need to find a number that is bigger, but be careful of the the units! (remember when you were taking science classes, your teacher always told you that you should write your units with your answer? well, he should have). mW is milliWatts, or 0.001W. So, 1W = 1000mW , 0.1W = 100mW, etc. Make sure when you are comparing, you are comparing them in the same units.
Now, the tricky part is if the converter only gives you either wattage or Amperage, and your devices gives the other measurement. What do we do here? Well, it's simple. Watt = Volt x Amps. That's it. So all you need to do, is convert one of the measurements to be the same as the other.
Example: Your device is rated at 600W, your converter output is rated at 110V at 2A. Can you use this converter for your device? Well, let's convert the amperage into Watts, 110V x 2A = 220W: so, your converter is rated for 220W which is way below your device requirement of 600W, so this particular converter will NOT work. Now, you see the vendor has another converter that probably weights like 40 lbs and cost 10 times as much, but it's output is rated at 110V at 10A. This gives you 110V x 10A = 1100W, almost double the wattage of your device requirement! So you can almost run 2 of your devices on this one converter alone... (I wouldn't do it though, since it's a tad below that number).
And there you have it. A few notes: just to make things simple, convert all your mA and mW to A and W first. The formula uses Volts and Amp to get Watts, not mV or mA or mW. Heavy duty converters can handle more power, but it will be bigger, heavier, and more expensive. If you have a really powerful converter, you can run multiple devices off of it (say you plug a power strip to the outlet of the converter and plug multiple devices into it). This is ok as long as the SUM of the Wattage of all your devices is less than the Wattage rating of your converter.
Edit: One more note. When looking at the rating of the converter, make sure you at looking at the OUTPUT information, and not the INPUT information. You just need to match the INPUT voltage to the voltage of the country you are in.
Quote: (04-07-2013 07:28 PM)clever alias Wrote:
Quote: (04-06-2013 10:26 AM)Pacific Wrote:
Sounds like you are getting your Watts confused with your Volts.
both possible and likely. all i know is every foreign adapter does not generate sufficient power