Spiral turbine casing and bicycle: what they have in common

1. Step 1. Spiral turbine casing — is part of — Water turbine. It distributes water evenly around the circle.
2. Step 2. Water turbine — is part of — Hydroelectric power station. Water turbines.
3. Step 3. Hydroelectric power station — has part — Electric generator. Generators.
4. Step 4. Electric generator — is part of — Bike light with dynamo. A dynamo.
5. Step 5. Bike light with dynamo — is part of — Bicycle. A lamp.

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