Freezer and transformer: what they have in common

1. Step 1. Freezer — has part — Compressor. A compressor compresses the refrigerant.
2. Step 2. Compressor — is part of — Ventilator. A compressor or turbine.
3. Step 3. Ventilator — is part of — Ambulance. Medical equipment.
4. Step 4. Ambulance — has part — Defibrillator. A defibrillator.
5. Step 5. Defibrillator — has part — Transformer. Stepping up the voltage.

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