Photoelectric effect and conveyor belt: what they have in common

1. Step 1. Photoelectric effect — uses — Electron. Electrons are knocked out.
2. Step 2. Electron — is used in — Hall sensor. The magnetic field deflects the electrons.
3. Step 3. Hall sensor — uses — Magnetism. It responds to a magnetic field.
4. Step 4. Magnetism — is used in — Hard disk drive. Magnetic recording.
5. Step 5. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
6. Step 6. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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