This page (revision-30) was last changed on 2019-12-23 04:14 by Murray Altheim

This page was created on 2019-12-23 01:01 by Murray Altheim

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USB Power Supplies
USBPowerSupplies

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At line 15 changed one line
products. Apple seems to be the worst: they sell two adapters (listed as the ''Apple 87W USB-C Power Adapter'' and the ''96W USB-C Power Adapter'') that are likely the most expensive on the market and are not showing their output ratings in watts but seemingly their power ''requirements'', i.e, not what they __deliver__ but what they __use__. Of course it says nothing about this on the box. It's 87 watts, right?
products. Apple seems to be the worst: they sell two adapters (listed as the ''Apple 87W USB-C Power Adapter'' and the ''96W USB-C Power Adapter'') that are likely the most expensive on the market and are not showing their output ratings in watts but seemingly their power ''requirements'', i.e, not what they __deliver__ but what they __use__. Of course it says nothing about this on the box. It's 87 watts, right? [{Image src='USBPowerSupplies/5w-adapter-thumb.png' link='https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/5w-adapter-tech-spec.png' caption='Apple 5 watt USB adapter' alt='Apple 5 watt USB adapter' align='right' class='imgFloatRight'}]
At line 17 changed one line
Apple is really relying on the ignorance of its customers here. [{Image src='USBPowerSupplies/5w-adapter-thumb.png' link='https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/5w-adapter-tech-spec.png' caption='Apple 5 watt USB adapter' alt='Apple 5 watt USB adapter' align='right' class='imgFloatRight'}]
Apple is really relying on the ignorance of its customers here.
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To give you an idea of how far this is off from that advertised 87 watt promise, delivering 87 watts at 5 volts it should be delivering __17.4 amps__. Apple's unit is clearly using 87 watts to deliver 15 watts (3 amps at 5 volts) of power. You can check this yourself by using an online [Watts to Amps Calculator|https://www.rapidtables.com/calc/electric/Watt_to_Amp_Calculator.html] or [Amps to Watts Calculator|https://www.rapidtables.com/calc/electric/Amp_to_Watt_Calculator.html].
To give you an idea of how far this is off from that advertised 87 watt promise, delivering 87 watts at 5 volts it should be delivering __17.4 amps__. Apple's unit is clearly using 87 watts to deliver 15 watts (3 amps at 5 volts) of power. You can check this yourself by using an online [Watts to Amps Calculator|https://www.rapidtables.com/calc/electric/Watt_to_Amp_Calculator.html] or [Amps to Watts Calculator|https://www.rapidtables.com/calc/electric/Amp_to_Watt_Calculator.html].
At line 23 changed one line
[{Image src='USBPowerSupplies/12w-adapter-thumb.png' link='https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/12w-adapter-tech-spec.png' caption='Apple 12 watt USB adapter' alt='Apple 12 watt USB adapter' class='imgFloatLeft'}] What's strange is that Apple has delivered honest reporting on its other units. Their tiny 5 watt unit delivers 5 volts at 1 amp. Their 12 watt unit delivers 5.2 volts at 2.4 amps. They provide technical specification for these smaller models, but the "Tech Specs" for the 96 watt model just says "USB C". What gives?
What's strange is that Apple has delivered honest reporting on its other units. Their tiny 5 watt unit delivers 5 volts at 1 amp. Their 12 watt unit delivers 5.2 volts at 2.4 amps. They provide technical specification for these smaller models, but the "Tech Specs" for the 96 watt model just says "USB C". What gives? [{Image src='USBPowerSupplies/12w-adapter-thumb.png' link='https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/12w-adapter-tech-spec.png' caption='Apple 12 watt USB adapter' alt='Apple 12 watt USB adapter' class='imgFloatRight'}]
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If the Raspberry Pi people say your Pi needs 3 amps, that's not how much power the adapter is __using__ (including power wasted through conversion, heat, etc.), it's how much it's required to __deliver__.
If the Raspberry Pi people say your Pi needs 3 amps, that's not how much power the adapter is __using__ (including power wasted through conversion, heat, etc.), it's how much it's required to __deliver__.
This page (revision-30) was last changed on 2019-12-23 04:14 by Murray AltheimTop