Porta automática e lead–acid battery: o que têm em comum

1. Passo 1. Porta automática — tem como parte — Motion sensor. A sensor.
2. Passo 2. Motion sensor — utiliza — Infrared radiation. Passive infrared.
3. Passo 3. Infrared radiation — é utilizado em — Pulse oximeter. Infrared absorption by haemoglobin.
4. Passo 4. Pulse oximeter — faz parte de — Smartwatch. A heart-rate and SpO₂ sensor.
5. Passo 5. Smartwatch — tem como parte — Lithium-ion battery. Powered by a lithium-ion battery.
6. Passo 6. Lithium-ion battery — evoluiu de — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.

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