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I understand your concern regarding the power that this charger draws from the wall and also puts out on the other side to the phone. One thing you can be sure, the manufacturer has made sure that the charger will not overheat and create the risk of fire.It''s interesting that this charger can have a different wattage output with the different amperage & voltage ratings. I wonder what that does for the power draw itself the charger will command from an extension cord, wall outlet, or power strip. Mind you at the very most a wall outlet can support 15A at 125V. My question behind all of this how safe is turbo-charging usage over-and-over-again over time, due to excessive heat emission & trying to encase all that raw energy within a small plastic confined cube?
Amps times Volts equals Watts. That's the law of current. So if you take the Volts of 5. and multiply it by the Amps of 1.6, you come back to the number of Watts it is putting out on the output side of 8. In turn, the number of Watts it's pulling from the wall would be approximately the same amount, but slightly more due to heat that's generated in the process of converting from alternating current to direct current, regulating and filtering that voltage, stepping down the voltage from 110 Volts to 5 Volts, and limiting the current.
In this case, to allow for the waste heat generated, that charger would probably be pulling somewhere on the order of 10 to 15 Watts maximum from the 110 Volt AC outlet. That is only twice the amount of current than a small night light light bulb draws from your electric outlet.
Even at the highest Voltage/Amperage combinations of 12 Volts - 1.2 Amps, and 9 Volts - 1.6 Amps, it is only putting out 14.4 watts, and so would be drawing maybe 18-20 watts at 110 Volts AC. The unit is rated at from 100 to 250 Volts, and a maximum of .5 Amps, so one half Amp versus the maximum of a standard outlet of 15 Amps, means it's pulling a maximum of 1/30th of the total power it's designed for. In Watts, that's a maximum of 50 Watts at 100 Volts, and 125 Watts at 250 Volts. I'm going to guess that .5 Amp maximum is at the 100 Volt figure, and that at 250 Volts it will only draw 20 Watts.
Rated maximums are often more than twice what they will really draw, so if it's rated at .5 Amps, I wouldn't be surprised if under normal circumstances it didn't actually draw more than 20 to 25 Watts or about .25 Amps at 100 Volts.
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