Biology / Unit 3 Bio 0504 short lesson, about 20 seconds
The First Law of Thermodynamics
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The idea
The first law of thermodynamics holds the universe's total energy constant — energy transfers and transforms but is never created or destroyed.
In practice
A plant does not create energy from sunlight; it transforms light energy into the chemical energy stored in a sugar molecule.
Where people slip
This law governs transformation and transfer only — not how efficiently a transfer proceeds.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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