Which USB versions provide 0.5 amps of power?

USB versions 1.0, 1.1, and 2.0 are designed to provide up to 0.5 amps of power. This capability allows devices connected through these versions to draw sufficient current for basic power needs, such as powering small peripherals like keyboards, mice, or low-power devices.

In contrast, USB 3.0 and later versions, including USB 3.1 and USB 4.0, provide higher power levels, often up to 0.9 amps for USB 3.0, and significantly more for USB Power Delivery specifications found in later versions. Thus, the maximum current output increases as the USB standard evolves, making the lower power provided by USB 1.0, 1.1, and 2.0 distinctly relevant for basic applications.