Answer the following question given this paragraph: 

Galvanic cells have positive cell potentials, and all the reduction reactions are reversible. The reaction at the anode will be the half-reaction with the smaller or more negative standard reduction potential. Reversing the reaction at the anode (to show the oxidation) but not its standard reduction potential gives: Anode (oxidation):.


Q: What kind of cells have positive cell potentials, and all the reduction reactions are reversible?


A:
galvanic cells