Well, yes, watts is simply volts * current, there are different combinations and not all power supplies are capable of all the different combinations. Those little 5 watt night light bulbs get wicked hot, and they are in a free air environment. It might not sound like much, but 18 watts without good heat dissipation adds up quickly and electronics do not like heat. That said, what it requires is probably not 18 watts continuous. somebody would need to actually measure the current draw in a worst case scenario (likely maximum volume - probably with a lot of bass). Perhaps they wanted 20 watts to account for cable losses at higher currents.Īs for the power requirement of the HomePod mini. My understanding of the USB spec is that +5V is available (at different current ratings depending on the USB variant). 18 amps at 1 volt or 1 amp at 18 volts both equal 18 watts. Watts (or power) is simply volts * current. I wonder if the HomePod mini never really needed 20w, just the 20w power profile and the firmware update simply allows it to use the 18w profile. That's cool that Apple was able to do this with a software update.Īgreed - I was reading in another (MagSafe duo?) thread about USB power profiles the way I understand it is newer USB power supplies offer a different range of voltage and current combinations, so 18 watts with one supply is not the same as 18 watts in another.
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