Pressure cooker and transformer: what they have in common

1. Step 1. Pressure cooker — has part — Safety valve. Papin invented the safety valve precisely for his digester.
2. Step 2. Safety valve — is part of — Boiler. A mandatory safeguard for boilers.
3. Step 3. Boiler — is part of — Steam turbine. Steam from the boiler.
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.

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