First Law for a Heat Engine

Net Energy Transferred by
Heat for the Cycle
Net Energy Transferred by Work for the Cycle
Sign convention arrow for work.
Sign convention arrow for heat.
Generic system boundary.
A cycle diagram for a heat engine or power cycle.  The system gets heat from the hot reservoir, produces a net amount of work and rejects some heat to the cold reservoir.
Energy Balance for the Cycle
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Ch 4, Lesson F, Page 5 - First Law for a Heat Engine