Tumble dryer and voltaic pile: what they have in common

1. Step 1. Tumble dryer — has part — Heat pump. Heat-pump models.
2. Step 2. Heat pump — is used in — Air conditioner. An air conditioner is a heat pump that carries heat out of the room.
3. Step 3. Air conditioner — is part of — Data centre. Cooling.
4. Step 4. Data centre — has part — Uninterruptible power supply. Backup power.
5. Step 5. Uninterruptible power supply — has part — Lead–acid battery. A battery.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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