The terminology was first used by Faraday (in the 1830s or 40s). But in this case it is which way round you connect the external battery that determines in which direction the ions travel, and therefore which electrode is which! In the photocell the illuminated electrode is always the cathode, because negative charge carriers can't flow towards the illuminated electrode, whichever way round the battery is connected, and there aren't any positive charge carriers! The same rule applies: the negative ions go to the anode, positive to the cathode. Cathode-ray-tube as a noun means A vacuum tube, used in monitors and televisions, in which a hot cathode emits electrons that are accelerated as a beam t. Suppose we have a symmetrical device such as a water electrolysis cell with identical platinum electrodes. Applying the rule in the first paragraph to other cases: in a battery (on discharge) the anode is the negative terminal the cathode the positive, but for a diode the anode is the electrode to which you connect the positive terminal of your power supply if you want the diode to conduct. In a polarized electrical device, a cathode is considered the electron donor or the source of electrons. The behavior of the cathode is the opposite to that of an anode. So, in your second diagram, the electrode labels are the wrong way round. The electrode at which the reduction occur is called cathode. Cathode: A cathode is a negatively charged metal electrode from which conventional current travels in a polarized electrical device. The cathode can be negative like when the cell is electrolytic (where electrical energy provided to the cell is being used for decomposing chemical compounds) or positive as when the cell is galvanic (where chemical reactions are used for generating electrical energy). The anode is the electrode towards which negative carriers move (or away from which positive carriers move) vice versa for the cathode. In chemistry, a cathode is the electrode of an electrochemical cell at which reduction occurs. In this type of diode, one material ( n) in which electrons are charge carriers abuts a second material ( p) in which. The most common type of diode uses a p - n junction.
CATHODE DEFINITION TV
In circuit diagrams, a diode is represented by a triangle with a line across one vertex. 85401130 85401144 85401148 85401150 Brief Description Cathode - ray TV & video monitor tubes, color, non - high definition, non - projection. Anode and cathode are defined according to the direction in which charge-carriers move in the device itself, be it a battery or photocell, or a passive device such as a diode. diode, an electrical component that allows the flow of current in only one direction.
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