Hourglass neck and electrical grid: what they have in common

1. Step 1. Hourglass neck — is part of — Hourglass. A narrow neck sets the rate.
2. Step 2. Hourglass — uses — Gravity flow. Sand pours through under gravity.
3. Step 3. Gravity flow — is used in — Water turbine. It is turned by falling water.
4. Step 4. Water turbine — is part of — Hydroelectric power station. Water turbines.
5. Step 5. Hydroelectric power station — is a kind of — Power station. A kind of power station.
6. Step 6. Power station — is part of — Electrical grid. Power stations feed the grid.

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