Hospital bed and transformer: what they have in common

1. Step 1. Hospital bed — has part — Lead screw. Adjustment by a screw.
2. Step 2. Lead screw — is part of — 3D printer. The axes are moved by screws.
3. Step 3. 3D printer — has part — Servomotor. Stepper motors.
4. Step 4. Servomotor — uses — Electromagnetism. A servo is an electric motor with feedback.
5. Step 5. Electromagnetism — evolved into — Electromagnetic induction. Faraday looked for the reverse of Ørsted’s discovery and found induction.
6. Step 6. Electromagnetic induction — is used in — Transformer. Induction between the windings.

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