Laser printer and transformer: what they have in common

1. Step 1. Laser printer — is used in — Desktop publishing. Output to a laser printer.
2. Step 2. Desktop publishing — uses — Personal computer. Page layout on a PC.
3. Step 3. Personal computer — has part — Power supply. The power supply turns mains power into the voltages the board and drives need.
4. Step 4. Power supply — has part — Transformer. A transformer.

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