ELECTRICAL ENCYCLOPEDIA

What is a SCADA?   The term SCADA usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas (anything from an industrial plant to a nation). Most control actions are performed automatically by RTUs or by PLCs. Host control functions are usually restricted to basic overriding or supervisory level intervention. For example, a PLC may control the flow of cooling water through part of an industrial process, but the SCADA system may allow operators to change the set points for the flow, and enable alarm conditions, such as loss of flow and high temperature, to be displayed and recorded. The feedback control loop passes through the RTU or PLC, while the SCADA system monitors the overall performance of the loop.  continue.. History of SCADA   SCADA (supervisory control and data acquisition) has been around as long as there have been control systems. The first ‘SCADA’ systems utilized data acquisition by ...

What is a SONAR?   Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar.  continue.. History of SONAR   Sonar is a system that uses transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distances underwater. It has been used for submarine and mine detection, depth detection, commercial fishing, diving safety and communication at sea. The Sonar device will send out a subsurface sound wave an...

What is a RADAR?   Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter.  continue.. History of RADAR   In 1934 a large-scale Air Defence exercise was held to test the defences of Great Britain and mock raids were carried out on London. Even though the routes and targets were known in advance, well over half the bombers reached their targets without opposition. Prime Minister Baldwin's statement "The bomber will always get through" seemed true. To give time for their guns to engage enemy aircraft as they came over, the Army was e...

Electrical Engineering http://en.wikipedia.org Anyone who is asking this question must be interested in taking up this course.So what is it really all about? You'll find out soon enough. Engineer's Duty www.wisegeek.com What does an electrical engineer do in his whole career? As an electrical engineer myself, i can say that this career offers many opportunities world-wide. Electricity is power and power is progress. Electrical Engineering History library.thinkquest.org 1  2   3 How did electrical engineering even exist? The technology we enjoy today is the result of an evolution which started centuries ago. Electrical Engineering Education History www.ncat.edu The electrical engineering curriculum dates back to the time when the study of this is considered lunacy. However, it was still worth a try. Institute of Electrical and Electronics Engineers www.ieee.org IEEE is a world renowned organization of Electrical engineers. Know more about th...