The tutor explains which terminal is the anode, which is the cathode, as well as polarity.

In terms of electrochemistry, oxidation occurs at the anode; reduction occurs at the cathode.

Perhaps less obvious is the answer to the question, “Which is positive and which is negative?”

At the cathode, reduction is occurring, so it consumes negative charge. Therefore, the cathode is positive.

At the anode, oxidation is occuring, so negative charge is being liberated. Therefore, the anode is negative.

Source:

Mortimer, Charles E. Chemistry, sixth ed. Belmont: Wadsworth, 1986.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.