Presentation on theme: "Energy Transfer by Heat, Work, and Mass"— Presentation transcript:
1 Energy Transfer by Heat, Work, and Mass CHAPTER 3Energy Transfer by Heat, Work, and Mass
2 Heat Transfer Heat, means heat transfer. Adiabatic – no heat transfer Energy transfer driven by temperature differencealways hotter to coolerAdiabatic – no heat transfersame as isothermal?Symbols used:Q and qQCaloric?
3 Work Energy transfer not driven by a temperature difference. Examples Rising pistonrotating shaftelectric wire crossing the system boundariesSymbols used:W and wW
5 Heat and Work Both heat and work are boundary phenomena. Systems possess energy, but not heat or work.Both are associated with a process, not a state.Both are path functionsMagnitudes depend on paths as well as end states
6 ProcessesProcess line, or pathState 1State 2P1P3P2
7 Electrical WorkWe = VIso We = VIΔt if V and I are constant.