Please connect the red wire to the positive electrode.
Tips
usage
Physics/chemistry term. The more common synonym is 正极 (zhèngjí) or 阳极 (yángjí); 阳电极 spells out 'positive (yang) electrode' explicitly. The opposite is 阴电极 (yīndiànjí, cathode).
memory
阳 = yang / positive (as in yin-yang), 电极 = electrode. The yin-yang split mirrors English 'anode / cathode.'