The capacity rating of a converter or adapter indicates the maximum current that can be pulled through it. Electrical devices may or may not be labeled with the current draw (the amount of current that the device "pulls"). If you are not sure of the current draw, you can check the original adapter's rating and use an adapter which provides at least that much capacity, or contact the device's manufacturer for a recommendation.
Current draw is additive; that is to say that if two or more devices are connected to a current source, the total current draw is equal to all of their current draws added together. For example, if two devices, one with a current draw of 250 mA and one with a current draw of 400 mA, are connected to a single source, then the total current draw on that source is 650 mA.
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