How is power supplied to a low-power USB device?
Through the USB cable power supplied to a low-power USB device .
The term USB stands for "Universal Serial Bus". USB cable assemblies are some of the most popular cable types available, used mostly to connect computers to peripheral devices such as cameras, camcorders, printers, scanners, and more.
USB stands for Universal Serial Bus, and there are four wires inside of it — usually, it's a red, green, white, and black cord. Each of these wires has a corresponding code: Red color indicates the positive wire with 5 volts of DC power. Black has always been the ground wire in almost all electronic devices.
Micro USB is a miniaturized version of the Universal Serial Bus (USB) interface developed for connecting compact and mobile devices such as smartphones, MP3 players, GPS devices, photo printers and digital cameras.