MOSFET and truck: what they have in common

1. Step 1. MOSFET — is part of — Switched-mode power supply. Switches.
2. Step 2. Switched-mode power supply — has part — Transformer. A high-frequency transformer.
3. Step 3. Transformer — is part of — Defibrillator. Stepping up the voltage.
4. Step 4. Defibrillator — is part of — Ambulance. A defibrillator.
5. Step 5. Ambulance — evolved from — Truck. A special-purpose vehicle.

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