introduction to computers lecture notes – As you all know that in today’s era computer is used in almost every field. In hospital, ticket reservation, data processing work, in weather department, in cinema, in office, in educational institutions, for multimedia designing work etc.
Computer is an electronic machine made by human, which is very useful and very important for our life. Today, any type of information can be obtained very easily with the help of computer, the speed of computing it has left behind even human beings, in this article we will know some basic and important things of computer.
what is computer ?
Computer is a fast computing tool. Originally the term computer referred to “a person who could perform numerical calculations with the help of a mechanical device.” “But now there is a computer – an electronic device that can receive instructions from outside. And can give numerical data or other types of information using a fixed program.
“Computer is an advanced electronic machine, which takes input from the user, and after processing the input given by the user, gives us the output (result).”
characteristics of computer
1.high speed – Computers have the ability to complete tasks at a higher speed than humans, they can do difficult tasks quickly.
2. Accuracy – When a task is done manually, there is always a possibility of human error, if the data input is correct then the computer can be used to perform the task in a manner that ensures accuracy
3. Storage – Computer can store large amount of information, after storing the information it can be brought back as needed.
4. Uniformity – the computer can do the same task over and over again with the same accuracy
4. Multidisciplinary – Computers are used to do both easy and difficult tasks
5. Cost-effective – computers reduce the amount of paperwork and human effort, thereby cutting costs
types of computer
1.types of computer based on application – Analog Computer, Digital Computer and Hybrid Computer
2.types of computer based on size – Microcomputer, Workstation Mini Computer, Mainframe Computer and Super Computer
personal computer and microcomputer
It is specially used by individual or small group, microprocessor is mainly helpful in making these computers, microprocessor is the chip on which (control unit) and (ALU) have a single unit. There is a circuit, microprocessor chip and other devices are kept in a unit, which is called system unit, it includes a system unit, a monitor or screen, a keyboard, and other devices such as printer, modem, speaker, scanner, plotter, graphic Tablet, light pen, etc.
fundamentals of personal computer
It is a system in which data and instructions are accepted through input devices, next to this input data and instructions are sent to the system unit, where according to the instructions (CPU) the data is processed or Performs the processing work and sends the result to the output unit, monitor or screen, this result is called output, in PC always keyboard and mouse are used in the input unit, while monitor and printer are used in the output unit.
input device – We send our instructions, programs and input data to the processor through keyboard, mouse, scanner etc.
output device – Once the program instruction is followed, the output is sent to the screen, printer, etc.
processing – The computer does not understand our language, the computer understands only the binary language, the computer first converts it into binary language to understand the language given by the user, then converts the binary data into the language given by the user so that the user results be able to understand.
Central processing unit – Central Processing Unit is also called Central Analyst Unit, it is that part of the computer, where the computer analyzes the received information, the Central Processing Unit can be further divided into three parts – Control Unit, (ALU) ), and memory.
Storage – Information is stored in storage mediums – hard disk, floppy disk, for future use.
different types of personal computer
Desktop computers – Desktop computers are usually placed on a desk or table, hence the name desktop, this type of computer is the largest of all PCs, each part of the desktop is usually separate and interchangeable.
Laptops and Notebooks – Laptops are small portable computers weighing up to a kilogram, modern laptops are often called notebook computers due to their small size.
Handheld Computers – Handheld computers are small carry-on computers designed to fit in your handbag or pocket. These computers usually won’t be desktop or laptop computers, but are powerful for specific tasks. are useful.
Tablet PC – Tablet PC is a type of notebook computer, by a special pay it allows the user to take notes or draw pictures, the input entered by the user can be edited.
5 advantages of computer
1.Speed - It can do a large amount of work in just a few seconds, where a human works on a particular task throughout the day, the computer does the same task in a very short time as compared to the human, the speed of the computer is divided into microseconds, nanoseconds and microseconds. Even measured in picoseconds.
Accuracy – The computer is capable of performing arithmetic calculations and logical operations with 100% precision and the same accuracy. A computer can make errors, but on the fault of a human, it can be due to wrong feeding of data or wrong setting by the programmer.
Perseverance – If you work continuously for 4 hours, you feel lack of concentration, tired and monotonous, but a computer is free from these, and you will get the result you want with the same speed and same precision.
Versatility – A computer can perform many tasks. It is used in data processing jobs, weather forecasting, ticket-reservation purposes, animation etc.
Networking and the Internet – computers are used to coordinate information across multiple locations.
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