  When a Dirac quantum state interacts with an applied electric field the
energy of the quantum state changes. It is generally assumed that there is a
maximum limit on the amount of energy that can be extracted from a Dirac
quantum state, due to its interaction with an electric field. In this article
it is shown that this assumption is not correct and that, for a properly
applied electric field, an arbitrarily large amount of energy can be extracted
from the quantum state.
