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The Computer Controlled PEM Fuel Cell Unit, "EC5C", has been designed by EDIBON to allow the students to understand the fuel cells technology, especially that of a proton exchange membrane fuel cell (PEM). It also enables to calculate several fundamental parameters of a PEM type fuel cell, such as power density, polarization curves, efficiency, etc., and the variation of some of these parameters in function of the consumption of reagents and the developed power. The "EC5C" unit is supplied with a stack of proton exchange membrane fuel cell (PEM) with a rated power of 100 W. The stack is composed of 24 cells with the shape of channeled plates that allow the air flow through the membrane. The membrane facilitates the hydrogen flow, generating the electrons release. There are separating plates which conduct electricity, allowing thus such electrons flow, between each pair of cells. Cells are self-humidifying and do not require any type of external humidification. The stack has an integrated fan able to provide the required air for good operation and to maintain the appropriate temperature. Hydrogen storage represents one of the essential points regarding the hydrogen economy. For