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Which of the following is NOT an input device?
Mouse
Speaker
Optical Character Reader (OCR)
Digitizer
Speaker
A speaker is an output device because it converts digital electrical signals into audible sound waves for the user. In contrast, input devices like mice, OCRs, and digitizers transmit data from the user or the environment into the computer system for processing.
A speaker is an output device because it converts digital electrical signals into audible sound waves for the user. In contrast, input devices like mice, OCRs, and digitizers transmit data from the user or the environment into the computer system for processing.
Think of an input device as a microphone (receiving your voice) and a speaker as the mouth (delivering the message to others); the speaker is where the information finally 'leaves' the system to reach your ears.
I-M-O-D (Input: Mouse, OCR, Digitizer) - the 'Speaker' is the odd one out as it is the Output.
f=T1тАЛ тАФ where f is the frequency of the sound wave and T is the period.
P=FтЛЕv тАФ representing the power delivered by the electromagnetic force on the speaker coil.
The speaker operates on the principle of electromagnetism. An internal coil (voice coil) moves within a magnetic field when an alternating current (audio signal) flows through it, causing a diaphragm to vibrate. These mechanical vibrations produce pressure waves in the air, resulting in sound, represented by the wave function y(t)=Asin(2╧Аft+╧Х).
Input devices send data to the CPU (e.g., keyboard, mouse, scanner).
Output devices receive data from the CPU to perform an action (e.g., monitor, printer, speaker).
Transduction is the core process: speakers transduce electrical energy to acoustic energy.
Converts processed binary data into human-perceivable audio format.
Cannot be used to provide commands or raw data to the computer system.
Multimedia playback and audio-visual communication.
Notification systems and alert sirens in computing environments.
| Feature | Input Device (Mouse) | Output Device (Speaker) |
|---|---|---|
Function | Sends data into the CPU | Receives data from the CPU |
Sound is a longitudinal mechanical wave requiring a medium for propagation.
Option A (Mouse) is a pointing input device; Option C (OCR) inputs text via image recognition; Option D (Digitizer) converts graphical input into digital coordinates.
B is correct тАФ A speaker is an output device that converts processed electrical data into audible sound waves.
In computer architecture questions, always classify devices by the direction of data flow: if the device informs the system, it is input; if the system informs the user, it is output.
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