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Definition: USB power


The USB-IF has defined power ratings with each USB version as well as a separate Battery Charging specification for power adapters. Over the years, the power capability of USB increased substantially from the original 2.5 watts to 100 (see USB Power Delivery). See also poweredUSB.
                     Maximum
  Version     Volts Amps    Watts

  USB 2.0      5v   .5A     2.5w

  USB 3.0      5v   .9A     4.5w

  Battery Charging
  BC 1.2       5v  1.5A     7.5w

  Power Delivery over USB-C cables
  PD           5v    3A    15w
  PD           9v    3A    27w
  PD          15v    3A    45w
  PD          20v    5A   100w
  See USB power delivery.