6.1 Energy and the First Law of Thermodynamics
Table of Contents
Add a header to begin generating the table of contents
Energy
Energy is the ability to do work. The SI unit of energy is the joule.
4.18J = 1 cal 1 Cal = 1kcal = 1000cal
| TYPES OF ENERGY |
|---|
| Thermal |
| Radiant |
| Mechanical |
| Chemical |
| Electrical |
| Nuclear |
1st Law of Thermodynamics
Energy cannot be created or destroyed (conservation of energy).
ΔE = q + w q = heat w = work
PV work (w = -PΔV)
| Signs for q and w |
|---|
| q > 0 heat is transferred into the system |
| q < 0 heat is transferred out of the system |
| w > 0 work is done on the system |
| w < 0 work is done by the system |