The external circuit in electrolysis is used to carry what?

• A. Electrons from the anode to the cathode
• B. Protons from the cathode to the anode
• C. Ions from electrolyte to electrodes
• D. Heat energy

Answer: (A)

The external circuit serves as the path for electrons. In electrolysis, the electrode where oxidation happens releases electrons, and those electrons travel through the external circuit to the electrode where reduction occurs. So, the external circuit carries electrons from the anode to the cathode. The ions stay in the electrolyte to balance charges, and heat energy isn’t the primary role of this circuit.