Water filter and electric generator: what they have in common

1. Step 1. Water filter — uses — Gravity flow. Water seeps through by gravity.
2. Step 2. Gravity flow — is used in — Water turbine. It is turned by falling water.
3. Step 3. Water turbine — is part of — Hydroelectric power station. Water turbines.
4. Step 4. Hydroelectric power station — has part — Electric generator. Generators.

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