# physics final

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1. 1st law of thermodynamics
the internal energy of a system can be increased by either adding heat or doing work on the system
2. ideal gas law
• an ideal gas is a gas for which the forces between atoms are small enough to be ignored.
• (Pressure x Volume)= (#gas atoms x Boltzman's constant x absolute temperature)

PV=NkT
3. convection
heat is transferred by the motion of a fluid
heat is transferred by electromagnetic waves
5. heat engine
• gasoline engine.  not all heat is used when burning
• Thermal engery- burning gas.
• some energy converted to work
• some heat is released into enviorment
6. efficiency
net work done by the engy by the amount of heat used to do this work.  E= W/Qh
7. e= W/Qh
• efficiency.
• convert to kelvins
8. carnot engine
• ideal efficiency
• Ec= (Th-Tc)/Th
9. second law of thermodynamics
some energy is always lost
10. heat pump
refrigerator- cold air becoming warmer
11. e=F/q
• electric field= force vector/ charge
• units are N/C
12. PE=qEd
electrostatic potential energy
13. V= PE/q
electric potential
14. V= Ed
relationship between electric field and potential
15. I= q/T
• electric current
• I is electric current, q is charge, and T is time
• unit =ampere= C/s
16. Ohms law
I= V/R

unit= Omega
17. electrical motive force
• E=I/R
• unit = voltage
18. P=IE
Power supplied by the battery.
19. P=VI
power dissipated by a resistor
20. energy
• power/time
• kilowatt kW
 Author: Siobhan ID: 188835 Card Set: physics final Updated: 2012-12-12 03:38:18 Tags: physics final Folders: Description: physics final Show Answers: