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 Type A connectors, officially called Standard-A connectors, are flat and rectangular in shape. Type A is the original USB connector and is the most recognizable and commonly used connector. USB Type-A connectors are supported in every USB version, including USB 3.0, USB 2.0, and USB 1.1. USB 3.0 Type A connectors are often, but not always, the color blue. USB 2.0 Type A and USB 1.1 Type A connectors are often, but not always, black. Note: The male USB Type A connector is called the plug and the female connector is called the receptacle but is commonly referred to as the port.