Rubber inflation bulb and electrical grid: what they have in common

1. Step 1. Rubber inflation bulb — is part of — Blood pressure monitor. It forces air in.
2. Step 2. Blood pressure monitor — evolved into — Digital blood pressure monitor. An automatic blood pressure monitor.
3. Step 3. Digital blood pressure monitor — has part — Strain gauge. A pressure sensor.
4. Step 4. Strain gauge — uses — Electrical resistance. Resistance changes under strain.
5. Step 5. Electrical resistance — is used in — Power line. High voltage reduces resistive losses.
6. Step 6. Power line — is part of — Electrical grid. Power lines.

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