FC0-U41 · Question #269
At what voltage does a USB host supply power to the USB bus?
The correct answer is B. 5 volts. A USB host supplies power to the USB bus at 5 volts. The USB light is a device that uses power from the bus to power small LEDs. USB lights are generally used for lighting keyboards at night. Most of the USB devices that require more power to operate have separate power…
Question
At what voltage does a USB host supply power to the USB bus?
Options
- A15 volts
- B5 volts
- C50 volts
- D3 volts
How the community answered
(43 responses)- A2% (1)
- B74% (32)
- C7% (3)
- D16% (7)
Explanation
A USB host supplies power to the USB bus at 5 volts. The USB light is a device that uses power from the bus to power small LEDs. USB lights are generally used for lighting keyboards at night. Most of the USB devices that require more power to operate have separate power outlets. Universal Serial Bus (USB) is a high speed bus standard developed by Compaq, IBM, DEC, Intel, Microsoft, NEC, and Northern Telecom. It provides the Plug and Play capability of Windows to external hardware devices. USB supports hot plugging, which means that a USB device can be installed or removed while the computer is running. A single USB port can be used to connect up to 127 peripheral devices, such as CD-ROM drives, tape drives, keyboards, scanners etc. USB 1.1 has a maximum data transfer rate of 12 Mbps, whereas USB 2.0 has a maximum data transfer rate of 480 Mbps. USB 2.0 is fully backward compatible with USB 1.1.
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