Which one of the following best describes an input device?

Question

BlackTom AI · Accepted Answer

An input device translates human actions or data into electrical or digital signals the computer can process (e.g., keystrokes become binary codes, microphone audio is digitized).

1. Relevant knowledge points and concepts
- Definition: An input device supplies data and control signals to a computer by converting human-understandable information into machine-understandable form (binary/digital).
- Examples: keyboard, mouse, scanner, microphone, camera — these sense user actions or external information and produce signals the CPU can interpret.
- Interfaces and peripherals: Input devices are typically peripheral hardware connected via USB, Bluetooth, or other interfaces; they are not limited to being mounted on the motherboard.

2. Step-by-step reasoning
- Read each option and compare to the standard definition.
- Option b states conversion of human-understandable data to machine-understandable data, matching the standard definition exactly.
- Check other options for inconsistencies (see next section).

3. Calculations/intermediate steps
- No numerical calculations required. Logical elimination is used: match definition → select option that matches.

4. Why the correct answer is correct
- Option b precisely captures the fundamental role: converting human-readable/input data into a format the computer can process (e.g., keyboard key press → scan code → binary input to OS). This conversion is core to any input device’s purpose.

5. Why other options are incorrect
- a. Incorrect: describes an interface between secondary storage and CPU (that’s a storage controller or disk interface), not an input device’s role.
- c. Incorrect: false claim; input devices are commonly peripheral and not “always directly mounted on the motherboard.”
- d. Too broad: “any device that can communicate with the CPU” would include output devices and storage controllers; it does not uniquely define input devices.

6. Conclusion
Because option b matches the precise function of input devices and the other choices are wrong or imprecise, the correct answer is: b. An input device converts human understandable data to machine understandable data. This matches the provided answer.

Which one of the following best describes an input device?单项选择题

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