Chapter 18
Storage of Energy
18.1 Generalities
We define an energy storage device as one into which we transfer a certain amount of energy so that we can later recover a substantial part of it. Much of the time, the modality (see Section 2.4) of the energy transferred into the device is the same as that of the retrieved energy. In other words, if you store kinetic energy, you retrieve kinetic energy. A primary battery (such as a fuel cell to which we deliver chemical energy but, from which we extract electrical energy is not, strictly speaking, a storage device. On the other hand, a secondary battery (an accumulator) which is charged by electric energy and delivers electric energy is, therefore, a true storage device. However, seeing that there ...
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