Unit 2.1 Input devices
Unit 2.2 Output devices
Unit 2.3 Devices, software application and also equipment

By the finish of this chapter, you will be able to:

Describe assorted types of input gadgets, consisting of scanners, digital cameras, biometric input tools and also others Discuss the benefits, disbenefits and restrictions of miscellaneous input devices Exordinary how the top quality of scanners and also digital camages is measured Describe miscellaneous forms of output devices, consisting of display screen tools and also interenergetic whiteboards Discuss the benefits, disadvantages and also restrictions of assorted output devices Explain what criteria are offered to meacertain the top quality of display screen devices List and define the software program and devices needed to run input and output devices Discuss the function of optical character acknowledgment (OCR) and hand-held OCR devices


In Grade 10, you learned that hardware is the physical components of a computer. This contains items such as the monitor (or screen), keyboard and also computer mouse.

You are watching: Wireless audio-output connections typically use bluetooth technology.

An input tool is any device that allows you to enter data into a computer system and also communicate via it. Usual input gadgets incorporate keyboards, computer system mice, touchpads and touchdisplays. You additionally learned around the basics of digital cameras, scanners and also readers such as radio-frequency identification (RFID), magnetic strip and OCR readers. Other input tools are video and also audio input devices such as webcams and also microphones, and biometric input devices such as fingerprint scanners.

Output tools take the processed input from a computer and display screen it in a way that is easy for people to understand also. Screens are the primary output gadgets of any type of computer. Liquid crystal screens (LCDs) and also LED screens are the many well-known kinds. Printers are an additional widespread form of output gadget. Tbelow are 2 main printer kinds, namely inkjet and also laser printers.

Headsets and speakers are designed for audio output, through various other output tools being fax makers, multifunction tools (which integrate faxing, emailing and also printing) and data projectors.

Processing components incorporate hardware such as the:

Motherboard, which connects the components in a computer system and dwellings the ports, such as the global serial bus (USB), video graphics array (VGA) and also high-meaning multimedia interchallenge (HDMI) ports to attach input and also output devices. Central processing unit (CPU), which receives and carries out the instructions inputted by the user. Graphics handling unit (GPU), which makes the calculations and also adheres to the instructions important to screen images on a display.

Storage devices are the computer system components designed to keep (or store) data. This data can be the information essential to make the computer function, such as the operating mechanism or fundamental input/output system (BIOS), or data developed by the user, such as images, records, message papers and also so on.

These components, dubbed storage media or storage gadgets, are any piece of computing hardware provided to keep or keep information files. They deserve to host and keep information permanently or temporarily and can be interior or external.

Internal storage media, such as tough drives and also RAM, are inside a computer and also part of it, while exterior difficult drives and USB drives are outside a computer system and also can be rerelocated quickly and also quickly.

UNIT 2.1   Input devices

As you learned in Chapter 1, a computer system functions making use of the indevelopment processing cycle. Input gadgets are the essential components of the initially phase of the cycle, the input stage. Input gadgets are what we use to connect through a computer. These deserve to be things such as key-boards and computer mice, touchpads and also scanners. The combination of keyboard and computer mouse supplied to be the the majority of prevalent input tool, however the increase of the smartphone has actually made the touchdisplay the most famous and also prevalent input tool in the modern-day age.

There has also been a climb in the usage of alternate input tools, such as fingerprint and also confront acknowledgment to unlock your smartphone, and speech-to-type gadgets that are supplied by civilization with physical challenges.

This unit focuses on input tools various other than the mouse and the key-board as they were spanned in Grade 10.


There are a variety of input tools that you deserve to usage with computer systems. Table 2.1 lists these tools, their offers, and their advantages and disadvantages.

Table 2.1: Input devices



Tright here are 3 primary components that recognize the top quality of the image taken by a scanner. These are:

1. Colour depth

2. Resolution

3. Dynamic range

Colour depth is also well-known as bit depth and refers to the variety of bits offered to indicate the colours of a solitary pixel. The better the bit number, the better the colour depth. You can watch this in Figure 2.1.

Figure 2.1: 32-little (left) versus 8-bit (right) colour depth.

The image on the left is in 32-little bit colour while the picture on the best is in 8-little bit colour. In the photo on the left, the details in the background are sharper and the colour of the leaf is deeper and even more vivid compared to the photo on the best.

Resolution is the amount of detail a photo can host and it is measured in pixels per inch (ppi) or dots per inch (dpi). These dimensions show you exactly how many kind of dots or pixels are in a one-inch square (an inch is about 2,5 cm). The better the ppi or dpi, the more information tbelow is in the square. This indicates that the photo will be of better quality.

The final top quality variable is the dynamic range. This steps the array of light the scanner deserve to check out and usage to develop a range of tones and also colours.

Camera high quality is figured out by 3 factors:

1. Resolution

2. Lens aperture

3. Focal length

Resolution is the amount of detail that a electronic camera can capture. In digital camperiods, resolution is measured in megapixels.

The lens aperture is the maximum amount that the lens have the right to open up. The bigger it opens up, the more light it can take in, which indicates that you need much less light to take a good picture.

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How much a cam deserve to zoom is identified by its focal length. The focal size is presented by a number and also the times symbol (×). A zoom of 3× implies that the longest focal size is 3× the distance of the shortest focal size.