All matter such as solids, liquids, and gases, is composed of atoms. Therefore, the atom is considered to be the basic building block of matter. However, atoms are almost always grouped together with other atoms to form what is called a molecule. Only a few gases such as helium are composed of individual atoms as the structural unit. Atoms are extremely small.
What is the Difference between USB Type A and USB Type B Plug/Connector? In the Catalog for USB-232/485 Series Interfaces, it says that the 1-port interface has a USB Type A plug whereas the 2- and 4-port interfaces have a USB Type B connector. What is the difference?
USB Data Cables. USB or Universal Serial Bus is a common PC connection standard that lets you attach a variety of peripherals including hard drives, mice, keyboards and media players. USB connectors come in several variations, known as Type A, Type B and so on. You can recognise them by the USB logo (a circle with three arrows coming out of it) that usually appears on the cable. The most common is USB type A: a flat, silver connector terminating in a squat, rectangular face.