Computer & IT Awareness
Global Positioning System
The Global Positioning System (GPS) is a satellite-based navigation system that was developed by the U.S. Department of Defense (DOD) in the early 1970s. Initially, GPS was developed as a military system to fulfill U.S. military needs. However, it was ..
Mobile Telephony: 1G, 2G, 3G, 4G and 5G basics
The name Cellular Phone is derived from the partition of a Geographic Region into smaller areas which are called “Cells”. The Voice and data exchanged between the Mobile terminal and phone / internet is transmitted via the Mobile Network which ..
Optical Fibres
The optical fibre is the medium for carrying the information from one point to another in the form of light. A basic fiber optic system consists of a transmitting device that converts an electric signal into in light signal and ..
GPRS
Sony Ericsson T39m cell phone was the first GPRS enabled phone in world. General Packet Radio Service (GPRS) allows information to be sent and received across a mobile telephone network. It supplements Circuit Switched Data and Short Message Service. Please ..
Wi-Fi
Wi-Fi stands for Wireless Fidelity. It is a wireless-based transmission of Internet signals in a form of a radio wave at spot frequency of 2.4 or 5 GHz at a high speed of 11 million bits per second within a ..
Bluetooth
Bluetooth is a low cost, low power, radio interface standard for wireless communication over short distances. It’s an open standard for allowing intelligent devices to communicate with each other. This allows any sort of electronic equipment (from computers and cell ..
Electro-Magnetic Waves
When light is passed through a prism, it is separated into all colors of rainbow, which is known as visible spectrum. Theory of EM spectrum There are some properties of light which can be explained by particle nature and other ..
Infrared Waves
Infrared waves have very short wavelengths, which are longer than the visible light at 0.74 micrometers, and extending conventionally to 300 micrometers. These wavelengths correspond to a frequency range of approximately 1 to 400 THz. 7 bands of Infrared Radiation The ..