Electrical grid and conveyor belt: what they have in common

1. Step 1. Electrical grid — uses — Three-phase system. A three-phase system.
2. Step 2. Three-phase system — is used in — Induction motor. Three phases create a rotating field.
3. Step 3. Induction motor — has part — Ball bearing. Bearings.
4. Step 4. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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