Podcast
Questions and Answers
What is the definition of an input device?
What is the definition of an input device?
Any device that allows a computer to receive data from the outside world.
How many types of scanners are there?
How many types of scanners are there?
5
What type of scanner is used at airports to read passport pages?
What type of scanner is used at airports to read passport pages?
2D scanners
What type of scanner uses gamma rays?
What type of scanner uses gamma rays?
What is the name of the input device that reads a series of dark and light lines of varying thickness?
What is the name of the input device that reads a series of dark and light lines of varying thickness?
What does the light line represent in a barcode?
What does the light line represent in a barcode?
Where is the most common place that barcode readers are used?
Where is the most common place that barcode readers are used?
What does QR stand for in QR code?
What does QR stand for in QR code?
How many times more data (approximately) can a QR code hold compared to a barcode?
How many times more data (approximately) can a QR code hold compared to a barcode?
What are 3 automatic adjustments that a microprocessor in a digital camera makes?
What are 3 automatic adjustments that a microprocessor in a digital camera makes?
What is the name of the cell that light passes through the lens onto in a digital camera?
What is the name of the cell that light passes through the lens onto in a digital camera?
What determines the file size of a photograph?
What determines the file size of a photograph?
What are two external factors that affect the quality of the photograph?
What are two external factors that affect the quality of the photograph?
What is the name for the most common input device?
What is the name for the most common input device?
What do most computer systems use to prevent the microprocessor waiting for keys to be pressed?
What do most computer systems use to prevent the microprocessor waiting for keys to be pressed?
What injury are users prone to who do a lot of typing?
What injury are users prone to who do a lot of typing?
What are the two most common pointing devices?
What are the two most common pointing devices?
Which port connects the mouse to the computer?
Which port connects the mouse to the computer?
What 3 common features do all mice have?
What 3 common features do all mice have?
What is the most common environment for where trackerballs are used?
What is the most common environment for where trackerballs are used?
What is the name of the device that is used to input sound into a computer?
What is the name of the device that is used to input sound into a computer?
What is the name of the device that converts analogue data to digital data?
What is the name of the device that converts analogue data to digital data?
What are the 3 types of touchscreen?
What are the 3 types of touchscreen?
What general type of touchscreen allows users to utilize while wearing gloves or using a stylus?
What general type of touchscreen allows users to utilize while wearing gloves or using a stylus?
What are the most common types of sensors?
What are the most common types of sensors?
What is the name of the device that converts digital data to analogue data?
What is the name of the device that converts digital data to analogue data?
What component of a machine is responsible for controlling systems in control applications?
What component of a machine is responsible for controlling systems in control applications?
How would monitoring sensors be used in a hospital?
How would monitoring sensors be used in a hospital?
What are two ways that control sensors are used on the street?
What are two ways that control sensors are used on the street?
In street lighting, how long is a lamp left on or off for before readings are sampled again?
In street lighting, how long is a lamp left on or off for before readings are sampled again?
What are the benefits of high-level languages?
What are the benefits of high-level languages?
Examples of high-level languages?
Examples of high-level languages?
Why do people use low-level languages?
Why do people use low-level languages?
What are the advantages and disadvantages of machine code?
What are the advantages and disadvantages of machine code?
Define a compiler.
Define a compiler.
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Study Notes
Input Devices
- Input devices allow computers to receive data from the outside world.
- Common input devices include keyboards, mice, and barcode readers.
Scanners
- There are five types of scanners.
- 2D scanners are used at airports to read passport pages.
- SPCET scanners utilize gamma rays for scanning.
Barcodes and QR Codes
- Barcode readers read a series of dark and light lines of varying thickness.
- Light lines in a barcode represent the value of 0.
- Barcode readers are predominantly found in supermarkets.
- QR stands for Quick Response, allowing for faster data access.
- QR codes can hold approximately 200 times more data than traditional barcodes.
Digital Cameras
- Digital cameras automatically adjust shutter speed, aperture size, and image size.
- Light-sensitive cells capture light through the lens in a digital camera.
- The file size of a photograph is determined by the number of pixels.
- Quality of a photograph can be affected by the type of lens and lighting conditions.
Common Input Devices
- The keyboard is the most common input device used.
- A keyboard buffer prevents the microprocessor from waiting for key presses.
- Repetitive Strain Injury (RSI) is a common injury among frequent typers.
Pointing Devices
- Mice and trackerballs are the two most common pointing devices.
- Mice connect to computers via USB ports.
- Mice typically have two buttons and a scroll wheel.
- Trackerballs are often used in control room environments.
Sound and Data Conversion
- Microphones are used to input sound into computers.
- Analogue to Digital Converters (ADC) convert analogue data into digital form.
- Digital to Analogue Converters (DAC) do the opposite, converting digital data to analogue.
Touchscreens
- Three types of touchscreens are: capacitive, infra-red, and resistive.
- Resistive touchscreens allow usage with gloves or stylus.
Sensors
- Sensors can be classified as monitoring or control sensors.
- Monitoring sensors, used in hospitals, track patient vital signs.
- Control sensors manage systems such as street lighting and traffic control.
Programming Languages
- High-level languages are easier to read and understand, quicker to write, simpler to debug, and easier to maintain.
- Examples of high-level languages include C++, Java, Python, and Visual Basic.
- Low-level languages are used for special hardware, specific machine instructions,less memory consumption, and speed optimization.
- Machine code is difficult to comprehend, primarily written in binary, and not commonly used by programmers.
Compilers
- A compiler translates high-level language programs into machine code, processing one line at a time.
- Compiled programs can run independently without the compiler.
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