Rotating aluminium disc and zip: what they have in common

1. Step 1. Rotating aluminium disc — is part of — Electricity meter. It is turned by eddy currents.
2. Step 2. Electricity meter — uses — Electromagnetic induction. An induction meter has a rotating disc.
3. Step 3. Electromagnetic induction — is used in — Electric toothbrush. Wireless charging by induction.
4. Step 4. Electric toothbrush — is made of — Nylon. The bristles are nylon.
5. Step 5. Nylon — is material for — Backpack. Nylon.
6. Step 6. Backpack — has part — Zip. Zips.

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