we use our forefinger to move the wheel to scroll up or down in a document. Most of the latest mouses, these days, include a wheel in the middle of two buttons that help us to scroll through documents more easily.

We also use mouse for drawing in paint and kid pix. The mouse is used in windows based programs, where the user can run the commands by pointing the objects with the help of pointer and clicking the buttons on the mouse. When the mouse is moved on the mouse pad, a light beam underneath reflect to give motion to the pointer on the screen. It is basically a pointing device which works on the principle of Point and Click. Mouse is another input device which is commonly found connected with the computers. The keyboard was invented 134 years ago by Christopher L. There are 104 buttons on the keyboard which are called keys.

It is used to enter data and instructions directly into the computer. It is the most commonly used input device. Which of your sense organs work like input devices? Various types of input devices can be used with the computer depending upon the type of data you want to enter in the computer, e.g., keyboard, mouse, joystick, light pen, etc. The devices which are used to give data and instructions to the computer are called Input Devices. To do all these, different types of input and output devices can be connected with the computer. But how do you give data and instructions to the computer and how it can return the useful information to you. After processing the raw facts (called data), it produces useful information for the user. That can be used with the computer.Ĭhildren you know that computer is a data processing machine and it needs user’s instructions to perform any job. so to work with these data types we need different type of devices which can help us to enter such data types in the computer and to receive their outputs as well in this chapter we will cover many such devices like keyboard, mouse, joystick, light pen, printer, speaker, etc.

Computer being a versatile machine can process different types of data.

Project on input and output devices