As I was reading about the experimental arrangement for photoelectric effect, I saw a diagram that puzzled my knowledge of electrodes. I found that in the experimental setup the cathode of the photoelectric plate or emitter was connected to the positive terminal of the cell. Why is it so? How can a negative electrode be connected to positive terminal of a cell?

I read Wikipedia article on cathode and it said " In a device which consumes power, the cathode is negative, and in a device which provides power, the cathode is positive". What does this mean?


marked as duplicate by Waffle's Crazy Peanut, user10851, Qmechanic Jun 17 '13 at 1:33

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  • $\begingroup$ Possible duplicate of physics.stackexchange.com/q/35939/11062 $\endgroup$ – Waffle's Crazy Peanut Jun 16 '13 at 14:00
  • $\begingroup$ The Wiki article on Cathode and Anode are very much satisfactorily written... $\endgroup$ – Waffle's Crazy Peanut Jun 16 '13 at 14:07
  • $\begingroup$ It would be a great help if you make me clear with an example about the devices that give power and consume power? $\endgroup$ – Ufomammut Jun 17 '13 at 0:47
  • 1
    $\begingroup$ Please have a look at the Wiki articles I've linked to. Both have more or less the same explanation. The intro at the start gives some examples on the devices. $\endgroup$ – Waffle's Crazy Peanut Jun 17 '13 at 5:26