Multiple choice

How is power supplied to a low-power USB device?

  1. Through a power cable

  2. From an external power supply

  3. Directly from the computer's power supply

  4. Through the USB cable

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Low-power USB devices receive power through the USB cable itself, eliminating the need for separate power cables or external power supplies. This is one of USB's key advantages - it carries both data and power. The computer's power supply provides electricity through the USB port and cable.