this post was submitted on 12 Nov 2023
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As USB gets upgrades to provide more power, we will need those barrel jacks less and less. My laptop can only charge 65W from USB C, but 130W from the barrel jack. It's a couple of years old now, I think from before there was a standard for USB to provide over 100W, but USB C can provide 240W now. So new laptops shouldn't even need barrel jacks anymore.
I don’t know how I feel pumping 240 W through these flimsy wires. I know it’s probably alright, but still… it doesn’t look like it’s meant to take 40 amps.
I recently ordered several 240W PD USB-C cables and you should rest assured, they are chonkier
Thanks for the info!
I think if a device follows the standard, the 240 W mode should use 48 V * 5 A - still more than you'd use with normal USB cables, but less insane than 12 V * 20 A
I was guesstimating 40A × 5V. Your numbers sound reasonable!
If the cable is USB-IF certified you can trust it.
It's only 5 amps, not 40. Magic of increased voltage.
You still need the PSU brick cable part to generate that kind of power.