Coal and personal computer: what they have in common

1. Step 1. Coal — is used in — Power station. The first stations ran on coal.
2. Step 2. Power station — is part of — Electrical grid. Power stations feed the grid.
3. Step 3. Electrical grid — has part — Transformer. Transformer substations.
4. Step 4. Transformer — is part of — Switched-mode power supply. A high-frequency transformer.
5. Step 5. Switched-mode power supply — is part of — Personal computer. A power supply.

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