Here's a breakdown of the input and output of a pencil sharpener:
Input:
* Dull Pencil: The primary input is a pencil that needs sharpening.
* Human Power/Force: This is the energy required to turn the handle (if manual) or to hold the pencil in place and activate the mechanism (if electric).
* Sharpener Mechanism/Machine: The pencil sharpener itself is required to perform the task.
Output:
* Sharpened Pencil: The main output is a pencil with a sharpened point.
* Pencil Shavings: These are the waste product resulting from the sharpening process.
* Heat: Some sharpener models produce heat when sharpening pencils.
* Sound: The noise generated by the sharpening process is also an output.
* Dust: Some very old or worn-out pencil sharpeners will produce pencil dust as a part of their output.
In Essence:
The pencil sharpener transforms a dull pencil into a sharpened one, while also producing shavings and consuming energy (either human or electrical).
