“What determines the charge rate? Is it the pad or the brick that plugs in the wall? In other words, If I buy this 10w charging pad and power it with a 25W fast charging brick, will it charge at 25W?”
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The pad. Lower power wall adapters produce slower charging speeds or, in some cases, don’t power the pad at all. The Qi (chee) 1.2 standard supports charging speeds of up to 15 watts (9 volts, 1.67 amps), but 7.5 W and 10 W chargers are more common right now. iPhones can charge at speeds of up to 7.5 W via regular Qi charging or 15 W with an Apple-certified MagSafe Charger. Many Android phones can do up to 10 W, and some even support 15 W charging (Samsung series 20 and above). 5W chargers are slower. Long story short, you need to know your phones capability to charge (iPhone 7.5 to 15W and Android 10 to 15W). You also need to know the pads capability to charge (i.e. 5 to 15W). And if buying a pad without an included cord/plug, make sure you are providing a cord/plug that provides the juice necessary to power the pad at the level it can handle. I would not try to "overpower" a pad, unless it utilizes technology that limits overpowering. My 2 cents.
Sorry, there was a problem. Please try again later.It would still charge at 10w, as the pad is what is creating the charge and the max it perform at is 10w. Also, be ready for one to die within 2 weeks.
Sorry, there was a problem. Please try again later.Here is real down-to-earth easy answer. Start with a wall charger that plugs into the wall. Assume its rating is 5V@1A. This means it produces 5W of power at the output. Power = Voltage * Current ie P=VI. Side note, according to the power conservation law assuming zero losses, P_in = P_out, we have that you AC outlet supplies less current, ie 5V *1A = 120V* ?A. You can solve this equation for an uknown to find the amount of current draws from an AC outlet. Moving on... the wall power charger produces 5W watt (per example) at the output. you plug the 25W charge pad into that. There is NO WAY you can get 25W out 5W. It is impossible. So there are two options: 1) the device will either not work OR 2) self-adjust to produce 5W instead of 25W. Keep in mind that: 25W = 5V*5A and 5W = 5V*1A, so the amount of current will be reduced. how it will behave depends on internal circuitry. It is your wall charger that will determine the operating regime of your charging pad. In turn, it is your charging pad that will drive the speed of charging of your device. Now, assume that you now have 50W wall charger, ie 5V@10A and your charge pad is rated at 25W ie 5V@5A, The pad will 'eat' 5A of 10A total possible current coming from the charger. The pad will operate at its most efficient regime, while charger will only supply 5A of current even though it can supply 10A. The ideal scenario is to match output wattage of the power supply to a wattage of the charging pad.
Sorry, there was a problem. Please try again later.No, this charging pad cannot charge at 25 W. Your device may charge more slowly with the charging pad than a charging cable. This is normal behavior.
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