It's not spontaneous. But when it's negative, the reaction is product favorite. It is spontaneous. Now, before we actually build a relationship and show how the cell voltage relates to GIBS free energy, let's examine something called electrical work. Now, we already spoke about electrical work when we spoke about electromotive force, but let's revisit this topic because it becomes important. So voltaic cells or electrochemical cells convert chemical energy into electrical potential energy that can be used to do work, for example, para light bulb or para motor.