A positive cell voltage indicates that our reaction within our electrochemical cell is product favorite, so it's spontaneous. Likewise, a negative cell voltage indicates a reactant favorite reaction. Recall that Gibbs free energy builds a relationship between entropy and entropy, and it also dictates whether a reaction is product favorite or reactant favorite. So notice that both cell voltage of an electrochemical cell and GIBS free energy dictate whether or not a reaction is product favorite. So therefore, we can imagine that there's some type of relationship between cell voltage and gives free energy. Now, when gives free energy is positive, that means our reaction is reacting favorite.