F. 1 Computer Literacy
Chapter 2: Input and Output Devices
Chapter 2: Input and Output Devices
Input Devices
also install a numeric keypad to
An input device lets users input data and
make inputting numbers easier.
instructions.
Some notebook computer users
Types of input devices: 1.
Keyboard
A keyboard is similar to a typewriter,
which lets us type in characters, which include: i.
Ergonomic keyboards help users reduce repetitive stress injuries (RSI).
Letters e.g., a, B, c, …, Y, z
ii.
Digits e.g., 0, 1, 2, …, 8, 9
iii.
Symbols e.g., !, %, #, …
Most keyboards use the QWERTY layout.
A MIDI keyboard is an electronic piano keyboard connected to the computer. (MIDI stands for Musical Instrument Digital Interface.)
For touch typing, each finger is responsible for typing certain keys on the keyboard.
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F. 1 Computer Literacy
2.
Chapter 2: Input and Output Devices
Pointing Device
A graphic tablet consists of an electronic board and a pen (i.e., the
A pointing device allows us to
stylus). It can be used for drawing
control a pointer on the screen.
and handwriting input.
Mouse
is
the
most
common
Other pointing devices include:
pointing device. Touchpad
Trackball
i.
Mechanical mouse has a ball on its underside. Trackpoint
Joystick
ii.
Optical mouse uses light to detect movement.
Joypad
Steering Wheel
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F. 1 Computer Literacy
3.
Chapter 2: Input and Output Devices
Image Scanner
4.
Barcode Scanner
An image scanner converts a picture into a digital image.
A barcode scanner or barcode reader allows direct input of data
The resolution of an image scanner
by reading the barcode.
is measured in dpi (dots per inch).
The higher the resolution, the better the quality.
It is faster and more accurate than manual input.
5.
Microphone
A
With
OCR
(Optical
Character
Recognition) software, scanned text
can be converted into editable
A microphone lets users input sound into the computer.
form.
Scanner
OCR Software Editable Text
Printed Document
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F. 1 Computer Literacy
6.
Chapter 2: Input and Output Devices
Digital Camera and Web Cam
ii.
LCD monitor is smaller in size and lighter.
A digital camera or web cam can input photos or videos into a computer.
2.
Data Projector
The quality of a digital camera is also determined by its resolution.
Combined with suitable output devices, video conferencing can be conducted so that people from different places can meet and see
each other through a computer network.
A data projector uses strong light beams to project images on a large screen.
It allows a group of people to see the image clearly.
3.
Printer
Printers output text and graphics on
Output Devices
paper, producing hard copies to the
An output device gives output to users.
user.
Types of output devices: 1.
i.
quality and inexpensive colour
Monitor
Inkjet printers produce high output.
Monitors output text, graphics, and video on the screen. i.
CRT monitor is larger in size.
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F. 1 Computer Literacy
ii.
iii.
Chapter 2: Input and Output Devices
Laser printers produce high
v.
printers
can
quality output quickly and
print banners and very large
quietly.
output.
Dot-matrix printers are noisy and produce poor quality
4.
output. However, they can
Speaker and Headphone
print multi-part forms and can
Speaker and headphone are audio output devices that produce sound
work in dusty environment.
iv.
Large-format
or music.
Multi-function printers are all-in-one machines that can print, scan, fax and make photocopies of documents.
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F. 1 Computer Literacy
Chapter 2: Input and Output Devices
Vocabulary
Accurate (adj. 準確的)
Multi-function Printer (n. 多功能打印機)
Audio (adj. 聲音的)
Numeric Keypad (n. 數字小鍵盤)
Barcode Scanner (n. 條碼掃描器)
Optical Character Recognition (n. 光符識別)
Character (n. 字元)
Optical Mouse (n. 光學式滑鼠)
Convert (v. 轉換)
Pointer (n. 指標)
CRT Monitor (n. 陰極射線管顯示器)
Pointing Device (n. 指示裝置 / 指標器)
Data Projector (n. 數據投射器)
Repetitive Stress Injuries (n. 重復性勞損)
Digit (n. 數字)
Resolution (n. 解晰度)
Digital (adj. 數碼的)
Screen (n. 屏幕)
Digital Camera (n. 數碼相機)
Sound (n. 聲音)
Direct (adj. 直接的)
Speaker (n. 揚聲器)
Dot-matrix Printer (n. 點陣打印機)
Stylus (n. 記錄筆)
Editable (adj. 可被編輯的) / Edit (v. 編輯)
Symbol (n. 符號)
Ergonomic Keyboard (n. 人體工程學鍵盤)
Text (n. 文字)
Graphic Tablet (n. 圖形輸入板)
Typewriter (n. 打字機)
Graphics (n. 圖像)
Video (n. 視像)
Hard Copies (n. 硬複本)
Video Conferencing (n. 視像會議)
Headphone (n. 耳筒)
Web Cam (n. 網絡攝像機)
Image Scanner (n. 影像掃描器)
Inkjet Printer (n. 噴墨打印機)
Keyboard (n. 鍵盤)
Large-format Printer (n. 大尺寸打印機)
Laser Printer (n. 激光打印機)
LCD Monitor (n. 液晶體顯示器)
Letter (n. 英文字母)
Mechanical Mouse (n. 機械式滑鼠)
Microphone (n. 麥克風)
MIDI Keyboard (n. 樂器數位界面鍵盤)
Mouse (n. 滑鼠)
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