Input
The process of entering data into a computer using devices like keyboard
Processing
A collection of steps,decisions and calculations taken to convet data into information
Storage
Is where data and software and even output results ate kept when the computer is not busy with that specific task or when the computer is switched off
Communication in the information processing cycle
The transfer of data or information between devices often through networks or the internet
Advantages of a keyboard as an input device
The fastest way to enter text especially for someone who can type quickly and accurately
Easy to learn and use
Limitations of using keyboards
It was not designed to be used with an GUI interface
Some users,like people with disabilities or people who suffer from arthritis, can find it difficult to use
Takes up space,especially when used with mobile devices,which is why many devices now make use of on-screen keyboards
What ergonomic features should you consider when buying a keyboard?
Wrist rest support
Softer key presses
Split or angled keyboards
What ergonomic features should you consider when buying a mouse?
Shape and grip to reduce strain
Position and angle allowing natural wrist position
Troubleshooting
Troubleshooting is the process of finding, diagnosing, and fixing problems or faults in a computer or device
What can you do if a wired keyboard is not responding?
Disconnect and reconnect the keyboard.
Try a different USB port.
Reboot the computer.
If still not working, replace the keyboard or test another keyboard to pinpoint the problem.
What can you do if a wireless keyboard is not responding?
Replace the batteries.
Remove and reinsert the USB dongle.
Try a different USB port.
What causes sticky keys and how can you fix them?
Problem: Keys don’t pop back up quickly or easily.
Solution:
Switch off the computer.
Unplug the keyboard.
Clean with a damp cloth or small brush
What is a mouse commonly used for?
A mouse is used to interact with graphic elements on a GUI and to give commands by clicking, double-clicking, dragging, and scrolling.
Advantages of a mouse
Is an easy to learn devices and provides an effective way to interact with graphical elements on the screen
Disadvantages of using a mouse
Requires a suitable clear surface area on which a mouse can be used
An entry level mouse is generally not very precise or accurate when used for creating or editing graphics
Sticky mouse problem
Problem : cursor movement is erratic or unresponsive
Solution:
Clean the mouse
Check the mouse pad for smoothness
Replace battery if wireless
Verify USB/connection port is secure
Mouse not responding
Wireless mouse:
Replace the batteries.
Remove and reinsert the USB dongle, possibly in a different port.
Wired mouse:
Disconnect and reconnect the mouse.
Try a different port.
General solution:
Reboot the computer if the problem persists.
What are the limitations of touchscreens?
Some touchscreens need extra pressure and may seem unresponsive
Quality depends on the operating system being used
Not easy for certain tasks, e.g., entering large amounts of text
What are the advantages of touchscreens?
Serves as both a mouse and a keyboard
Allows natural input, such as drawing and gestures
Enables intuitive interactions (e.g., swiping, pinching, expanding)
What are the limitations of a touchpad?
Less accurate and precise than a mouse, especially for drawing
Some users find drag-and-drop difficult due to limited size
Cannot be repositioned relative to the screen for greater comfort or ease of use
What are the advantages of a touchpad?
Built into the device, so the user does not need to carry an extra device like a mouse
Allows actions normally done with a mouse without needing a desk or extra surface (even when standing or using the laptop on the lap)
How can human input devices lead to inaccurate or invalid data?
People make mistakes when entering data.
Inaccurate or invalid data requires manual checking or software validation.
Tools to help accuracy: input masks, drop-down lists, date pickers, etc.
What are the security risks associated with human input devices?
Keyloggers: Software that records every key pressed and can track mouse activity.
Spyware: Software installed to monitor user activity without permission.
Trojans: Hidden keyloggers inside seemingly useful software (e.g., screensavers).
All of these are types of malware.
Risk: Passwords and personal information can be stolen.
OCR software
Software that is used to convert scanned images of text into text that can be edited in a word processor
