Thermodynamics and lead–acid battery: what they have in common

1. Step 1. Thermodynamics — is used in — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.
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.

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