Woodwind key mechanism and electrical grid: what they have in common

1. Step 1. Woodwind key mechanism — is part of — Flute. Boehm’s keys close the holes.
2. Step 2. Flute — uses — Sound wave. Sound.
3. Step 3. Sound wave — is used in — Headphones. The diaphragm creates a sound wave.
4. Step 4. Headphones — has part — Copper wire. A cable.
5. Step 5. Copper wire — is part of — Power line. Wires (often aluminium).
6. Step 6. Power line — is part of — Electrical grid. Power lines.

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