Comment on Why are laptop adapters so much larger than phone adapters of same power rating?

onTerryO@lemmy.ca ⁨1⁩ ⁨week⁩ ago

• cron@feddit.org ⁨1⁩ ⁨week⁩ ago

  No USB power plug operates at 5 V when providing 65 Watts. That would be 13 Amps. Both power plugs most likey use 15 or 20 volts internally. 19 volts is not allowed over USB.

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• Kethal@lemmy.world ⁨1⁩ ⁨week⁩ ago

  Volts are not a unit of power. Watts are a unit of power.

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• rtxn@lemmy.world ⁨1⁩ ⁨week⁩ ago

  USB Power Delivery over a regular USB-C-compliant cable delivers a variable current of up to 3A, using discrete voltages of 5V for up to 15W of power, 9V for up to 27W, 12V for up to 48W, and 20V for up to 60W.

  Higher powers require dedicated USB PD-compliant cables that can handle up to 240W at a voltage of 48V.

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