Mastering Computer Studies: Unleash Your Potential in Computer Science and Hardware
COMPUTER SYSTEMS
Input devices
Machine readable form- this is a language that the computer understands i.e. binary language, assembly language etc Examples of input devices include: 1. Keying devices
This is the most commonly used keying method with desktop and laptop computers. Examples include:
Classification of the keyboard keys/ Parts of the keyboardSummary of keyboard keys and usesN/B:
ToggleKeys are designed for people who have vision impairment or cognitive disabilities. When ToggleKeys are turned on, your computer will provide sound cues when the locking keys (CAPSLOCK, NUMLOCK, or SCROLLLOCK) are pressed. Hold the num lock for five seconds to activate.
2. Pointing devices
These are devices used to control the pointer/cursor on the screen. Examples: mouse, joystick, trackball, light pen etc
3. Scanning devices
These are devices that capture data directly into the computer.
They can also be defined as devices that use a magnetic or photo-electric source to scan and convert images into electric signals that can be processed by an electronic apparatus, such as a computer. Uses of Scanning Devices
Classification of scanning devicesExamples of optical scannersDigitizers and Digital cameraAn interactive whiteboard (IWB)
Microfilm
Review questions
1. How does a computer differ from a calculator?
2.List any three safety precautions one should observe when entering a computer lab 3. Describe any two practices that can cause fire in the computer laboratory. 4. The keyboard has …….. groups of keys 5. Which key will press to:
7. Explain the functions of the following keys on the keyboard?
9. Define the following words
Trackball, Joy stock, IWB, Digitizer, Camera and light pen 11. What is the use of a dehumidifier? 12. Why should computer lab seats designed with a straight backrest? 13. Name two preventive measures you can take to avoid loss of data.
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