Metering chip module and shaduf: what they have in common

1. Step 1. Metering chip module — is part of — Smart meter. An ADC measures current and voltage.
2. Step 2. Smart meter — has part — Liquid-crystal display. A display.
3. Step 3. Liquid-crystal display — is part of — Electronic scales. The reading is on an LCD.
4. Step 4. Electronic scales — evolved from — Balance scale. Electronic scales.
5. Step 5. Balance scale — has part — Balance beam. An equal-armed lever.
6. Step 6. Balance beam — is part of — Shaduf. A long pole acting as a lever.

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