The series of issues and reasons to be alert while using USB and charging ports that were experienced about 15 years before now have all been modified. With the standardization of connectors and USB power supplies, which are generally applicable, one can charge a gadget over a friend via any wall or socket outlet or PC. It has equally become possible to connect any Android device to the computer and display images on the Television set too. It is an impressive turnout at such a time with high technological advancement. However, it is essential to note that all chargers are not of equal capacity just like the Power plugs around the world (ปลั๊กไฟ ทั่ว โลก, which is the term in Thai). Some USB sockets, when connected to a PC, are seeming of a higher power. On the other hand, some PCs, even when powered off, can still power a smartphone using a USB socket.
How the USB power works
Every USB falls under four specifications: USB 1.0, 2.0, 3.0(which is the most common), and 3.1. The USB connection operates a host(usually the USB) and device(Often the camera, smartphone, or PC) relationship. Power always flows from the host to the device, but data can move from both ends, like copying files from and between your PC and phone. USB devices are usually made up of pins and wires. The USB 1.0 and 2.0 contain four sets of pins and wires, respectively. Outwardly, it produces a powerful current of 5 volts while inwardly, the pins are marked as D+ and D-. The 3.0 USB cables are built up with more wires than the 1.0 and 2.0 cables. They are made up of nine wires. The Usb power plug Price (ปลั๊กไฟ USB ราคา ,which is the term in Thai) is considerably low too.
Talking about current measured by mA(milliamp) used by USB cables, three diverse ports have been identified.
- Standard downstream port
- Charging downstream port
- Dedicated downstream port
1 and 2 of the ports, as mentioned above, are associated more with the computers while the third is used for ordinary or dumb wall chargers.
