Question

when cathode is positive and anode is negative​

Answer 1

In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive. This seems reasonable as the anode is the source of electrons and cathode is where the electrons flow. However, in an electrolytic cell, the anode is taken to be positive while the cathode is now negative.

Answer 2

In electrochemical cell, cathode is +ve and and anode is -ve.