Charging station and watt steam engine: what they have in common

1. Step 1. Charging station — uses — Electrical grid. Powered from the grid.
2. Step 2. Electrical grid — has part — Power station. Power stations feed the grid.
3. Step 3. Power station — uses — Coal. The first stations ran on coal.
4. Step 4. Coal — is used in — Watt steam engine. Steam engines were fired with coal.

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