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I have measured the usage of two cell phone chargers using a Kill-A-Watt meter. The first, a 2005ish Motorola flip style, uses 0 watts with no phone attached (or at least not enough to register one watt) and 1 watt with the phone charging. The second, a 2008 Samsung candystick style also uses 0 (or <1) watt without the phone and 3 watts with the phone. More tests would ensure these numbers hold true for other models and manufacturers. You sometimes hear that cell chargers are big users, especially if left plugged in without the phone (vampire or phantom power). Assuming my two phones are representative, they would use 12 watts or less per day, or about 4kWh per year if left plugged in without the phone.
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∙ 15y ago
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