Light pen and electrical grid: what they have in common

1. Step 1. Light pen — has part — Photodiode. A photocell catches the CRT beam.
2. Step 2. Photodiode — is part of — Lidar. A receiver of reflected light.
3. Step 3. Lidar — is part of — Self-driving car. Lidar builds a 3D map of the surroundings.
4. Step 4. Self-driving car — evolved from — Electric car. Most self-driving cars are built on electric platforms.
5. Step 5. Electric car — uses — Charging station. It charges at charging stations.
6. Step 6. Charging station — uses — Electrical grid. Powered from the grid.

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