Night-vision device e mechanical clock: o que têm em comum

1. Passo 1. Night-vision device — utiliza — Photovoltaic effect. The photocathode of an image intensifier.
2. Passo 2. Photovoltaic effect — é utilizado em — Photodiode. Light generates a current in the junction.
3. Passo 3. Photodiode — faz parte de — Pulse oximeter. A photodiode.
4. Passo 4. Pulse oximeter — faz parte de — Smartwatch. A heart-rate and SpO₂ sensor.
5. Passo 5. Smartwatch — evoluiu de — Wristwatch. The form factor of a wristwatch.
6. Passo 6. Wristwatch — é um tipo de — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.

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