Trolleybus and vacuum pump: what they have in common

1. Step 1. Trolleybus — has part — Pneumatic tyre. Runs on tyres.
2. Step 2. Pneumatic tyre — is part of — Electric car. An electric car’s wheels have pneumatic tyres.
3. Step 3. Electric car — has part — Induction motor. The Tesla Model S had an induction motor.
4. Step 4. Induction motor — has part — Stator. The windings create a rotating field.
5. Step 5. Stator — is part of — Vacuum pump. A cylindrical chamber.

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