Rotating aluminium disc and archimedes’ screw: 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 — evolved from — Electromagnetism. Faraday looked for the reverse of Ørsted’s discovery and found induction.
4. Step 4. Electromagnetism — is used in — Starter motor. A starter is an electric motor.
5. Step 5. Starter motor — evolved from — Crank. It replaced the starting crank.
6. Step 6. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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