Transformer and electric fan: what they have in common

1. Step 1. Transformer — is part of — Nuclear power plant. Transformers step up the voltage so the plant's power can travel far.
2. Step 2. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.
3. Step 3. Nuclear reactor — is part of — Nuclear icebreaker. A reactor plant.
4. Step 4. Nuclear icebreaker — has part — Propeller. Propellers.
5. Step 5. Propeller — is part of — Electric fan. The blades.

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