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The easiest way to determine this is to look at the charger. On the transformer, there will be either a label or imprinted lettering that tells you what the input (meaning from the wall socket) is. Since most phones nowadays charge even while plugged into a USB port, that implies that the transformer is producing only 5 V DC at about 0.5 amps. As such, that means that at 125 V AC, the amount of power that is actually converted to 0.5 amps for the DC side is only about 0.02 amps from the AC side. Of course, there is some power lost during the conversion process, so that means that, for the sake of argument, the amount of power is actually used from the AC side is only around 0.1 amps, so about 12 watts of power. Thus, if you left your phone plugged into the charger for about 3-1/2 days, it would use about one kilowatt-hour of power. On average, that would be about 13 cents of your electric bill (including taxes and other fees).

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