Cyclic process

Definition

A cyclic process is a thermodynamic process in which a system returns to its initial state after undergoing a series of changes. In such processes, the net change in internal energy over one complete cycle is zero.

5 Must Know Facts For Your Next Test

1. In a cyclic process, the initial and final states of the system are identical.
2. The net work done by the system over one complete cycle equals the net heat added to the system.
3. Examples include the Carnot cycle and the Rankine cycle, commonly used in heat engines.
4. For an ideal gas undergoing a cyclic process, the area enclosed by the cycle on a PV diagram represents the work done by (or on) the system.
5. Cyclic processes are fundamental in understanding how engines convert thermal energy into mechanical work.

Review Questions

• What is the net change in internal energy for a system undergoing a cyclic process?
• How is work related to heat transfer in a cyclic process?
• Name two common examples of cyclic processes used in heat engines.

Related terms

Carnot Cycle: An idealized thermodynamic cycle that provides maximum efficiency between two temperature reservoirs.

PV Diagram:

$$Pressure-Volume$$ diagram; A graphical representation of changes in pressure and volume during thermodynamic processes.

Heat Engine: A device that converts thermal energy into mechanical work using cycles like the Carnot or Rankine cycles.