Types of Computers Computers are distinguished by a variety of criteria, which are related to each other to varying degrees. In everyday perception, such criteria as purpose, computing power and size of the computer are often linked. A type of computer that combines a large number of subtypes with different form factors is conventionally divided into two subtypes: desktop and laptop PCs. Desktop PCs are designed for permanent use indoors. They are installed on wide flat surfaces, such...

At the end of the 19th century, when the science of electricity was still in its infancy, one man made a discovery that forever changed our understanding of the world. This man is Heinrich Hertz, and his experiments with electromagnetic waves ushered in a new era in physics and technology. Discovery of electromagnetism In the second decade of the 19th century, Danish physicist and chemist Hans Christian Ørsted conducted research on Volta's electric batteries and the conductivity...