Game design FAQ. If you actually want to know how to become a game designer, start with the IGDA Breaking In site and Damion Schubert's Breaking In page, and check this list of game design blogs.
The first law of thermodynamics states that if a system follows a thermodynamic cycle (that is, ultimately returns to its initial state), then the total amount of heat transferred to the system over the course of the cycle is equal to the work performed by the system.
Conversely, the cycle may be reversed and use work to move heat from a cold source and transfer it to a warm sink thereby acting as a heat pump. During a closed cycle, the system returns to its original thermodynamic state of temperature and pressure.