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1 Definition: The anode of a device is the terminal where current flows in from outside. The cathode of a device is the terminal where current flows out. This is illustrated in figure 1.  A useful mnemonic is ACID : Anode Current Into Device.
exists and is an alternate of. Merge this question into. Split and merge into it. Answer by Sasher. Confidence votes 1.5K. A rotating anode promotes cooling between exposures by distributing the intense beam from the cathode over the surface of the anode.A rotating anode tube lasts a lot longer than a stationary x-ray tube.xists and is an alternate of. Merge this question into. Split and merge into it. Answer by Sasher. Confidence votes 1.5K. A rotating anode promotes cooling between exposures by distributing the intense beam from the cathode over the surface of the anode.