Twin: The Anode/Cathode Charge-Sign Reversal
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A galvanic cell's anode is negative and cathode positive, but an electrolytic cell's anode is positive and cathode negative, since an external source now forces electron flow.
Show
A galvanic zinc anode loses electrons willingly, reading negative; an electrolytic anode is forced to give up electrons, reading positive.
Watch for
Carrying galvanic signs onto an electrolytic cell reverses both electrodes, though "anode oxidizes" still holds.