Black powder charge and electrical grid: what they have in common

1. Step 1. Black powder charge — is part of — Rocket. Fuel that produces a jet when burned.
2. Step 2. Rocket — has part — De Laval nozzle. A narrowing at the outlet accelerates the gases and increases thrust.
3. Step 3. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.
4. Step 4. Steam turbine — is part of — Nuclear power plant. Steam turns the turbines — as at a thermal station.
5. Step 5. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.
6. Step 6. Transformer — is part of — Electrical grid. Transformer substations.

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