Perfect Computer Notes

Following are the main basic units or components of the computer : 1. Input Unit 2. Output Unit 3. Central Processing Unit( CPU / Processor) 4. Memory Unit 5. Storage Unit Diagram Showing Main Components or Basic Units of a Computer Different Basic Units or fundamental components of a computer Brief Description of Basic components of Computer 1. Input Unit Input unit consists of input devices . Input devices are used to enter data and instructions into computer memory. Examples of input devices are Keyboard, mouse, joystick and microphone etc. 2. Output Unit Output unit consists of output devices . Output devices are used to show results produced by computer after data processing. Examples of output devices are Monitor, Printer, plotter and  speaker etc. 3. Central Processing Unit Central processing unit is also called CPU or Processor . It is the brain of the computer. It performs data processing. It controls overall operations ...

Computers can be divided into the following 3 types on the basis of their working mechanism: 1) Analog Computers 2) Digital Computers 3) Hybrid Computers 1. Analog Computers Analog computer is used to measure continuous values. It measures a physical property like voltage, pressure, speed, time and temperature. An analog computer takes input in analog form and gives output in analog form. Its output is usually displayed on a meter or scale. Analog computer has low memory and fewer functions. Analog computer is mainly used in the field of engineering and medicine. Examples include: Examples of Analog Computers include:  1. Thermometer 2. Speedometer 3. Analog clock 2. Digital Computers A digital computer works with digital data. Digital computer uses binary number system. Binary number system consists of only two digits 0 and 1. A digital computer represents data in digital signals. A 0 represents OFF and a 1 represents ON. Digital computer performs a...

Following are the important characteristics of a computer : 1. Speed Computers work at a very high speed. They are much faster than humans. A computer can perform billions of calculations in a second. Computer speed is measured in Mega Hertz (MHz). 2. Storage A computer can store large amounts of data permanently . 3. Processing A computer can process the given instructions  for processing of data. It can perform different types of processing like addition, subtraction, multiplication and division. 4. Accuracy Accuracy means the capability to provide results without any errors. Computer can process large amounts of data and produce 100% accurate results. 5. Recalling A computer can recall the stored data and information at any time, as and when required. 6. Cost Reduction Computer can reduce cost. We can do a work in less time and cost by computer. A single person, with computer, can do work of many people in an office. 8. Versatile A computer can perfor...

Topic:  What is Computer Definition of Computer Computer is an electronic machine that takes data and instructions, processes data according to the given instructions, produces results and stores them for later use. What is a computer - Define computer - Computer Definition A computer is an electronic machine that can: Accept input, Process input, Produce output:  Accept input. Note that,  Input could be entered by a human through a keyboard, or received over a network, or provided automatically by sensors attached to the computer. Execute a set of instructions to process the input data. Produce output. Output could be data displayed to a human in the form of soft copy output or hard copy output, but it could also be anything that effects the world outside the computer such as electrical signals that control how a device operates. Today, computers are being used in every field of life. It can be used for different tasks. It is used for data processi...