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In this paper, using experimental results [1], empirical equations [2], and the concept of effective carriers while hopping in ionic conduction, an alternative explanation is discussed for open circuit voltage (OCV) using Sm‐doped Ceria electrolytes (SDC) in solid oxide fuel cells (SOFCs). Consequently, one chapter of the standard textbook [3] must be entirely modified. This alternative explanation not only coexists with major existing experimental results but also is useful for explaining minor experimental results. An experimental method is proposed to clarify the theoretical consideration.