Angular momentum and smart meter: what they have in common

1. Step 1. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
2. Step 2. Reaction wheel — is part of — Artificial satellite. Attitude control.
3. Step 3. Artificial satellite — includes — Space probe. A spacecraft.
4. Step 4. Space probe — has part — Radio module and antenna. Communication with Earth.
5. Step 5. Radio module and antenna — is part of — Smart meter. Data transmission.

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