You are both right, in a way. The main limitation on power delivery through a conductor is current (resistive losses/heat per Ohms law). To deliver more power through a smaller conductor requires raising the voltage, much as USB-C does, or the high-voltage transmission lines used for long-distance power delivery. But the challenges to deliver 2Ah (or let's call it 10Wh) in a few seconds to a phone are farcical, especially once taking into account the charge circuitry inside the phone.
Yeah. I see what you're saying. If you could magically plug your iPhone into your Macbook charger, it'd still take 290 seconds to deliver enough juice to change the battery, ignoring heat and losses. Then there's the amount of copper and shielding it'd take inside the phone to carry that much current. An iPhone is about a quarter the volume of the apple charger, but from the teardowns the DC side is about 25-20% of the size. I would find it reasonable if you wanted to assert that there would be no room for the 'iphone' inside of the case. It'd be all battery and charge controll circuits.
Even if you allow the usual marketing bullshit where anything under 2 minutes is allowed to be called 'seconds', we're still off by a factor of 3. You'd have to go through the next set of mental gymnastics where you say 'well if the phone charges that fast, I can just top it up whenever so it doesn't need to last for 3 days at a time'. In other words you could charge it 'in seconds' but you'll be doing that a couple times a day.
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You are both right, in a way. The main limitation on power delivery through a conductor is current (resistive losses/heat per Ohms law). To deliver more power through a smaller conductor requires raising the voltage, much as USB-C does, or the high-voltage transmission lines used for long-distance power delivery. But the challenges to deliver 2Ah (or let's call it 10Wh) in a few seconds to a phone are farcical, especially once taking into account the charge circuitry inside the phone.
Yeah. I see what you're saying. If you could magically plug your iPhone into your Macbook charger, it'd still take 290 seconds to deliver enough juice to change the battery, ignoring heat and losses. Then there's the amount of copper and shielding it'd take inside the phone to carry that much current. An iPhone is about a quarter the volume of the apple charger, but from the teardowns the DC side is about 25-20% of the size. I would find it reasonable if you wanted to assert that there would be no room for the 'iphone' inside of the case. It'd be all battery and charge controll circuits.
Even if you allow the usual marketing bullshit where anything under 2 minutes is allowed to be called 'seconds', we're still off by a factor of 3. You'd have to go through the next set of mental gymnastics where you say 'well if the phone charges that fast, I can just top it up whenever so it doesn't need to last for 3 days at a time'. In other words you could charge it 'in seconds' but you'll be doing that a couple times a day.