Paper feed rollers and lead–acid battery: what they have in common

1. Step 1. Paper feed rollers — is part of — Printer. Rollers pull the sheet through.
2. Step 2. Printer — includes — Inkjet printer. A printer.
3. Step 3. Inkjet printer — uses — Piezoelectric effect. Piezo heads eject droplets.
4. Step 4. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.
5. Step 5. Sonar — is part of — Submarine. Underwater acoustics.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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