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Is USB DC or AC?

in Electrical Engineering

Is USB DC or AC?

1 Answer

USB (Universal Serial Bus) provides **DC (Direct Current)** power, not AC (Alternating Current). The voltage typically supplied by USB ports is either 5V, 9V, 12V, or 20V depending on the USB standard (like USB 2.0, USB 3.0, or USB Power Delivery). In all these cases, the current flows in one direction, which is characteristic of DC.

So, when you plug your phone or laptop into a USB port, it’s getting direct current to charge or power the device.

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