Infrared seeker and electronic calculator: what they have in common

1. Step 1. Infrared seeker — has part — Photodiode. A photodetector.
2. Step 2. Photodiode — uses — Photovoltaic effect. Light generates a current in the junction.
3. Step 3. Photovoltaic effect — is used in — Solar panel. The photoelectric effect in a semiconductor.
4. Step 4. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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