How to Define Anode and Cathode

How to Define Anode and Cathode Heres a look at the difference between the anode and cathode of a cell or battery and how you can remember which is which. Keeping Them Straight Remember the cathode attracts cations or the cathode attracts charge. The anode attracts negative charge. Flow of Current The anode and cathode are defined by the flow of current. In the general sense, current refers to any movement of electrical charge. However, you should keep in mind the convention that current direction is according to where a positive charge would move, not a negative charge. So, if electrons do the actual moving in a cell, then current runs the opposite direction. Why is it defined this way? Who knows, but thats the standard. Current flows in the same direction as positive charge carriers, for example, when positive ions  or protons carry the charge. Current flows opposite the direction of negative charge carriers, such as electrons in metals. Cathode The cathode is the negatively charged electrode.The cathode attracts cations or positive charge.The cathode is the source of electrons or an electron donor. It may accept positive charge.Because the cathode may generate electrons, which typically are the electrical species doing the actual movement, it may be said that cathodes generate charge or that current moves from the cathode to the anode. This can be confusing, because the direction of current would be defined by the way a positive charge would move. Just remember, any movement of charged particles is current. Anode The anode is the positively charged electrode.The anode attracts electrons or anions.The anode may be a source of positive charge or an electron acceptor. Cathode and Anode Remember, charge can flow either from positive to negative or from negative to positive! Because of this, the anode could be positively charged or negatively charged, depending on the situation. The same is true for the cathode.