# 7: Conservation of Energy

- Page ID
- 81504

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- 7.01: Mechanics and the Mechanical Energy Balance
- Defining mechanical work and power, the work-energy principle, and the mechanical energy balance. Discussion of springs as a source of mechanical energy.

- 7.02: Four Questions
- Four questions needed to develop an accounting concept for the property of energy: What is energy? How can it be stored in a system? How can it be created or destroyed? How can it be transported? Conservation of energy and the work-energy principle.

- 7.03: Conservation of Energy
- Application of the conservation of energy principle to systems. Standard assumptions made about heat transfer and work in such applications. Includes multiple worked examples.

- 7.04: Substance Models
- Equations of state for two simple substance models: the ideal gas model with room-temperature specific heats and incompressible substance model with room-temperature specific heats. Includes several worked examples.

- 7.05: Flow Work and Flow Power Revisited
- More detailed explanation of flow work and flow power, in the case of systems with mass flow in/out and cases with multiple inlets/outlets.

- 7.06: Work and Power Revisited
- Introduction to the concept of transferring energy through quasiequilibrium vs non-quasiequilibrium work.

- 7.07: Heat Transfer Revisited
- Key concepts of heat transfer, including heat flux and the physical mechanisms (conduction, convection, and thermal radiation) by which heat transfer occurs.

- 7.08: Electrical Energy Storage and Transfer
- Instantaneous and average electrical power, for DC systems. Average electrical power for steady-state AC systems. Storage of electrical energy in resistors, capacitors, inductors, and batteries.

- 7.09: Thermodynamic Cycles
- Definition and classification of thermodynamic cycles. Discussion of power cycles, refrigeration cycles, and heat pumps, as well as their measures of performance.