Heat: Energy's Graveyard

Every energy conversion leaks some energy as heat. This is not a design flaw — it is a law of physics. The Second Law of Thermodynamics guarantees it.

Light bulbs, computers, your own body — everything radiates waste heat. An incandescent bulb turns only 5% of its electricity into light; the rest is heat. LED bulbs reach around 40%, which is why they feel cooler. Heat is not destroyed either — it spreads out, becoming less useful.