That’s because the difference between the iPhone and iPad adapters is the rated amperage. An iPad charge brick is rated to handle 2.1 amps, while the smaller iPhone charger is rated for just 1 amp.
Is 1a or 2.1 A faster?
Most smartphones require a minimum of 0.5A to charge, while some need 1A. Tablets often require a minimum of 1A and sometimes as much as 2.1A to charge. You can still plug smartphones into these higher-powered ports. In fact, they’ll charge faster if you do.
How much power does it take to charge a phone?
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.