At what voltage does a USB host supply power to the USB bus?

The correct answer is B. 5 volts. A USB host provides power to the USB bus at a standard voltage of 5 volts, which is essential for powering connected peripherals.

IT Concepts and Terminology

Question

Options

A15 volts
B5 volts
C50 volts
D3 volts

How the community answered

(29 responses)

B
90% (26)
C
7% (2)
D
3% (1)

Why each option

A USB host provides power to the USB bus at a standard voltage of 5 volts, which is essential for powering connected peripherals.

A15 volts

15 volts is not a standard voltage supplied by a USB host to the bus.

B5 voltsCorrect

The Universal Serial Bus (USB) standard specifies that the host supplies a nominal 5 volts (V) DC to connected devices for power, typically with a maximum current of 500mA for USB 2.0 or 900mA for USB 3.0 ports.

C50 volts

50 volts is an excessively high voltage and is not used for standard USB power delivery.

D3 volts

While some internal components might use 3.3V, the main power supplied by a USB host to the bus for external devices is 5V.

Concept tested: USB power delivery voltage

Source: https://learn.microsoft.com/en-us/windows-hardware/drivers/usb/usb-device-power-management

Topics

#USB power#USB voltage#hardware specifications

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