Electronic scales and voltaic pile: what they have in common

1. Step 1. Electronic scales — has part — Liquid-crystal display. The reading is on an LCD.
2. Step 2. Liquid-crystal display — is part of — Electronic calculator. An LCD display.
3. Step 3. Electronic calculator — has part — Alkaline battery. A calculator runs on a battery, sometimes on a tiny solar panel.
4. Step 4. Alkaline battery — evolved from — Dry cell. An improved zinc–manganese cell.
5. Step 5. Dry cell — evolved from — Voltaic pile. A convenient form of the galvanic cell.

Open Evothings