Science World

First Generation Computer (started from 1940 and lasted on 1956) is also called as Vacuum Tube Computers, because these used used vacuum tubes for circuitry and magnetic drums for memory and were often enormous to take an entire room space. These computers were difficult to operate also, used more space and electricity. As a result these created much heat which was often the cause of malfunctions. The whole machine is 51 feet long, weighs 5 tons, and incorporates 750,000 parts. . It used 3304 electromechanical relays as on-off switches, had 72 accumulators (each with its own arithmetic unit) as well as mechanical register with a capacity of 23 digits plus sign. The arithmetic is fixed-point, with a plugboard setting determining the number of decimal places. There are 60 sets of rotary switches, each of which can be used as a constant register - sort of mechanical read-only memory. First generation computers used machine language which is the lowest-level programming language understood by computers, to perform operations, and they could only solve one problem at a time.

Computer has developed gradually, in different phases. Each generation has brought a major change in computer's world. While this change made computer more accessible, reliable, cheaper and useful. Basically we divide computer development in 5 major sections. We can also call it a historical background of computer. These changes make the computer life complete. These generations are listed below:
First Generation (1940-1956) Vacuum Tubes.
Second Generation (1956-1963) Transistors.
Third Generation (1964-1971) Integrated Circuits.
Fourth Generation (1971-Present) Microprocessors.
Fifth Generation (Present and Beyond) Artificial Intelligence.

Jet engine basically works on the application of Sir Isaac Newton's third law of Physics, which says that every action has a reaction which is equal but in opposite side. air is taken into the inlet of a jet engine (suck) and then compressed (squeeze) by a series of rotors and stators. A fuel mixture is injected into the chamber with the compressed air and ignited. The subsequent combustion is directed, it results exhaust. Due to this Plane is pushed forward. Modern jet engine is made up of several rows of spinning propeller blades called Rotors.