21st November 2019

forbes
16

How much power does a cell phone charger use?

Far from anything worth being sheepish over, 1 kwh costs about 12 cents. To be specific, your iPhone battery holds a charge of 1,440 mAh, or about 5.45 watt hours. If you fully drained and recharged your phone everyday, then over the course of a year you would have to feed it about 2,000 watt hours, or 2kWh.

How many watts does a printer use?

An average ink-jet or laser printer which is designed for home use will typically use 30 to 50 watts when it is printing, in standby mode most printers will draw around 3 to 5 watts of power. Commercial printers which are used in an office will draw 30 to 50 watts on standby and 300 to 500 watts when printing.
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