Cycle rickshaw and transformer: what they have in common

1. Step 1. Cycle rickshaw — has part — Roller chain. A chain drive.
2. Step 2. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
3. Step 3. Electric bicycle — has part — Lithium-ion battery. A battery.
4. Step 4. Lithium-ion battery — is part of — Implantable defibrillator. Power comes from a lithium battery.
5. Step 5. Implantable defibrillator — evolved from — Defibrillator. An implantable one.
6. Step 6. Defibrillator — has part — Transformer. Stepping up the voltage.

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