Stretcher and steam turbine: what they have in common

1. Step 1. Stretcher — is part of — Ambulance. A stretcher.
2. Step 2. Ambulance — has part — Defibrillator. A defibrillator.
3. Step 3. Defibrillator — has part — Transformer. Stepping up the voltage.
4. Step 4. Transformer — is part of — Nuclear power plant. Transformers step up the voltage so the plant's power can travel far.
5. Step 5. Nuclear power plant — has part — Steam turbine. Steam turns the turbines — as at a thermal station.

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