Here's why:
* Shirt Button: A shirt button is a mechanical fastener. It relies on physical pressure to hold two pieces of fabric together. The button itself doesn't have any electrical properties.
* Key in an Electric Circuit: A key in an electric circuit acts as a switch. It completes or breaks an electrical circuit by establishing or removing a connection between two conductive points. This allows electricity to flow or stop flowing through the circuit.
Key Differences:
* Function: A button fastens fabric, while a key controls electrical flow.
* Mechanism: A button uses physical pressure, while a key relies on electrical conductivity.
* Material: Buttons can be made of various materials (plastic, metal, etc.), while keys are usually conductive metals.
In short, a shirt button is a purely mechanical device, while a key in an electric circuit is an electrical component. They are completely different in terms of function and mechanism.
