Which statement is true about the cathode and anode in an electrolysis setup?

In an electrolysis setup, the anode is indeed always positive. This is because the anode is the electrode where oxidation occurs, which involves the loss of electrons. Since electrons carry a negative charge, the anode must be connected to the positive terminal of the power supply to attract the negatively charged ions.

In contrast, the cathode, which is the electrode where reduction occurs (the gain of electrons), is negatively charged. This distinction between the roles and charges of the anode and cathode is fundamental in electrochemistry and explains many of the behaviors observed in electrolysis processes. Therefore, the statement that the anode is always positive accurately reflects this principle.