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Q. CAN U TELL ME THAT WHY CATIONS MOVE TOWARDS CATHODE AS BOTH ARE POSITIVELY CHARGED.....

Q. CAN U TELL ME THAT WHY CATIONS MOVE TOWARDS CATHODE AS BOTH ARE POSITIVELY CHARGED.....

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1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear Rahul,

A widespread misconception is that cathode polarity is always negative. This is often incorrectly inferred from the correct fact that in all electrochemical devices positively charged cations move towards the cathode (hence their name) and/or negatively charged anions move away from it. In fact cathode polarity depends on the device type, and can even vary according to the operating mode, as per the above electric current direction-based universal definition. Consequently, as can be seen from the following examples, in a device which consumes power the cathode is negative, and in a device which provides power the cathode is positive.

 

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