Topics
8.21: The Physics of Energy involves a close interplay between underlying physical theory and applications. Reflecting this, we develop physical principles in tandem with their applications to energy science. The subject material is loosely divided into three parts, which we cover sequentially through the semester.
In the first part, we focus on end uses of energy. Analysis of basic energy needs
such as transport, heating and lighting provide a context for reviewing basic principles
of mechanics and electromagnetism from 8.01 and 8.02. We introduce some
aspects of quantum mechanics and thermodynamics that are central to understanding
questions in energy physics such as limits to efficiency of conversion from heat
energy to mechanical energy in an automobile engine.
In the second part of the course, we focus on sources of energy. This material
represents a substantial part of the core of the course. Further development of quantum
mechanics provides the background for an in-depth introduction to the physics
of nuclear power. We follow the progress of solar energy from its release in nuclear
fusion reactions in the sun, through radiation to the earth and absorption in terrestrial
systems, integrating material from several branches of physics and including
an introduction to the physics of semiconductors and photovoltaic technology. Basic
fluid dynamics is developed and used to describe the physics of wind and other renewable
resources including hydro, tidal, wave and ocean power.
In the third part of the course, we
consider systems issues such as
energy storage.
We also consider
the physics of hazards associated
with some energy technologies, in particular
climate change and nuclear radiation. The course
concludes with a discussion of conservation and an overview of what we’ve learned. The complete list of lectures can be found here.