Posted by Tukana on .
Why is the sign for cathode positve and anode is negative in the galvanic cell?
Many students are taught through grade school and into high school that the anode is positive and the cathode is negative. I was too. Imagine my surprise when I learned that isn't always true. The answer to your question is in the definition. The definition is NOT about the polarity of the electrodes. The definition: Oxidation occurs at the anode. Oxidation is the loss of electrons. So in galvanic cells, the negative electrode is the anode. In electrolysis cells, the anode is the positive electrode.