Questions and Answers
What mechanism do resistive touchscreens use to detect touch?
How does a capacitive touchscreen determine where a user has touched?
Which of the following statements is true about capacitive touchscreens compared to resistive touchscreens?
What materials are typically used in the construction of resistive touchscreens?
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Which technology mentioned does NOT fall into the basic categories of touch sensor technologies?
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What is the primary advantage of using capacitive touch technology over resistive technology?
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What happens to the electrical charge in a capacitive touchscreen when a finger touches the screen?
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Which layer is responsible for detecting touches in a capacitive touchscreen?
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How do surface acoustic wave touchscreens detect touch?
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What function does a chip inside a resistive touchscreen serve?
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Study Notes
Computer Hardware Components
- Four primary components are input devices, Central Processing Unit (CPU), output devices, and memory/storage units.
Central Processing Unit (CPU)
- CPU functions as the "brain" of a computer, executing programs and processing data.
- Interprets program instructions and coordinates tasks within the computer system.
- Essential in all computer generations, alongside primary storage and input/output systems.
- Microprocessor: an integrated circuit CPU that performs arithmetic and logical operations based on stored instructions.
- As of the mid-1970s, microprocessor complexity and power have significantly increased, redefining "CPU".
CPU Structure
- Consists of two main units: Control Unit (CU) and Arithmetic and Logic Unit (ALU).
Control Unit (CU)
- Manages overall computer functions by fetching, decoding, and issuing signals for instruction execution.
- Does not process data directly.
Cache Memory
- A supplementary memory system that enhances processing speed by temporarily storing frequently used instructions and data.
- Access time ranges from 10 to 30 nanoseconds, significantly faster than main memory (RAM) access of around 60 nanoseconds.
Secondary Storage Devices
- Address limitations of main memory in terms of capacity and volatility.
- Non-volatile and high-capacity devices used for permanent data storage.
- Common examples include hard disks, magnetic tapes, and optical disks.
Hard Disk Drive (HDD)
- Comprises a stack of magnetic disks with a read/write mechanism.
- Disks are made from aluminum or glass, coated with magnetic material.
- Stores binary data in magnetic regions on each platter's surface.
- Read/write heads operate via a voice coil for precise data management.
Graphics Tablet
- Used for drawing or capturing signatures, featuring a pressure-sensitive surface.
- Converts analog signals from a stylus into digital input for display.
Touchscreen Technology
- A clear glass panel overlaying a display, allowing user interaction without traditional peripherals.
- Detects touch through various technologies, including resistive, capacitive, and surface acoustic wave systems.
Resistive Touchscreens
- Composed of flexible and rigid conducting layers; touching compresses these layers to register input.
Capacitive Touchscreens
- Utilize electrical charge storage on glass; touch decreases charge and calculates the touch point based on differences in charge readings, providing clearer display quality compared to resistive screens.
Summary of Touchscreen Technologies
- Different touch technologies include:
- Resistive: Lower light transmission (about 75%).
- Capacitive: Higher light transmission (about 90%), clearer images.
- Applications are widespread in smartphones, tablets, ATMs, and kiosks.
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Description
This quiz covers the essential components of a computer, including input devices, the Central Processing Unit (CPU), output devices, and memory/storage units. Test your understanding of how these components interact and their functions within a computer system.
