Lever and electrical grid: what they have in common

1. Step 1. Lever — is used in — Stretcher. Two poles — levers for carrying.
2. Step 2. Stretcher — is part of — Ambulance. A stretcher.
3. Step 3. Ambulance — has part — Defibrillator. A defibrillator.
4. Step 4. Defibrillator — has part — Transformer. Stepping up the voltage.
5. Step 5. Transformer — is part of — Electrical grid. Transformer substations.

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