What is the term for the positive electrode in a voltaic cell?

What is the term for the positive electrode in a voltaic cell?

• A. Cathode
• B. Anode
• C. Electrode
• D. Electrolyte

Answer: (A)

In a voltaic cell, the positive electrode is referred to as the cathode. This is the site where reduction occurs during the electrochemical reaction. In simple terms, reduction involves the gain of electrons, which happens at this electrode. Because it attracts cations from the electrolyte due to its positive charge, the cathode plays a crucial role in the overall operation of the cell. The flow of electrons from the anode, which is the negative electrode where oxidation occurs, to the cathode drives the electric current.

In contrast, the anode, which is the negative electrode, is responsible for oxidation and thus loses electrons. The term electrode generally refers to any conductor through which electricity enters or leaves an electrochemical cell but does not specifically denote whether it is positive or negative. The electrolyte is the medium that allows ionic movement and facilitates the flow of current but does not directly define any of the electrodes themselves. Understanding these roles and definitions is key to grasping how voltaic cells function in generating electrical energy.