Energy Transformation Flow

Trace energy through a system and identify where it is lost as heat

Chemical Energy (Fuel)

Stored in chemical bonds

↓

Combustion / Metabolism

Chemical to Thermal + Kinetic

↓

Useful Work

Motion, lifting, electricity

Heat loss to surroundings (~60-80%)

No energy conversion is 100% efficient. The Second Law of Thermodynamics says some energy is always lost as heat.