Down conductor cable and monitor: what they have in common

1. Step 1. Down conductor cable — is part of — Lightning rod. A conductor to the ground.
2. Step 2. Lightning rod — uses — Electrical conduction. It carries the current into the ground.
3. Step 3. Electrical conduction — uses — Electron. Current in metals is a flow of electrons.
4. Step 4. Electron — evolved from — Cathode-ray tube. Thomson discovered the electron in cathode rays.
5. Step 5. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.

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