I'm flipping out because I cannot find the answer to this anywhere. It's wholly philosophical. In reference to the amps of power supplies/adapters:

If all that matters is that enough amps are supplied, why aren't all power supplies/adapters just built with something like 100 amps or maybe 10 amps?

  • Why have us running around wondering: "Does this supply enough amps?"?

  • Why do they not all just supply plenty

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    \$\begingroup\$ Here's the first 12V 100A supply I found, do you want to use something this size/cost to charge your phone or run your portable radio: ebay.com/itm/… \$\endgroup\$ – PeterJ Nov 22 '15 at 10:36
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    \$\begingroup\$ To use the water analogy, why aren't all garden hoses the size of firehoses? \$\endgroup\$ – Nick Johnson Nov 22 '15 at 10:37
  • \$\begingroup\$ A cheap 5V 1A USB supply can rarely supply its 1A without overheating and losing regulation.. imagine building everything with.. 10, 100x times the necessary overhead.. \$\endgroup\$ – Wesley Lee Nov 22 '15 at 10:46
  • \$\begingroup\$ I do not think that your question has a philosophical background. It is simply a question to find the best trade-off between (necessary) performance and other important quantities like weight, cost, volume, reliability, ... Remember: Any technical device should not be as "good" as possible (that`s impossible!) but as "good" as necessary. \$\endgroup\$ – LvW Nov 22 '15 at 11:25

Building excess capcity makes the device larger, heavier, and most importantly more expensive

it's not that an overpowered power supply can't run a low powered device, it's just that a correctly sized power supply is usually better suited.

sure you can charge a phone from a 5000A capable 5V supply, but finding an outlet to plug it in is tricky and the wheelbarrow to transport it is inconvenient, much better is a pocket sized 2A charger....

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    \$\begingroup\$ Also a 5000A capable supply would cause you a lot of trouble if you accidentally shorted the output \$\endgroup\$ – Robert Stiffler Nov 22 '15 at 11:14
  • \$\begingroup\$ I'd like to see someone hook up a 5000A 5V supply to get at least 4.5V into a device using 5000A. \$\endgroup\$ – Asmyldof Nov 22 '15 at 12:58
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    \$\begingroup\$ I'd like to own a 5000 amp 5 volt supply. For... reasons. \$\endgroup\$ – Sean Boddy Nov 22 '15 at 17:27
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    \$\begingroup\$ 5 V / 5000A = 1mOhm. You'd need some pretty good wires in order to deliver this kind of parameters. \$\endgroup\$ – John Dvorak Nov 22 '15 at 20:07
  • \$\begingroup\$ Also, 5 V * 5000 A = 5 kW. Good luck keeping this kind of waste heat away from your superconducting power supply wires or else they won't be superconducting for long. \$\endgroup\$ – John Dvorak Nov 22 '15 at 20:11

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