Which of these is an example of output? typing on a keyboard
a smartphone ringing
using a mouse
a fingerprint sensor

a smartphone ringing

Explanation:

An output device is a computer hardware that converts data or signals into readable form like text, graphic, audio, video, tactile. Example of output devices are monitor, speaker, printer, projector. A smartphone ringing is a computer hardware because it converts the information into readable form in the form of sound.

Input devices is a computer hardware that sends information to the computer for interaction and control. Examples are mouse, keyboard, fingerprint sensor, scanner e.t.c.

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