So from outside circuit, current flows into the anode, which means that the electrons are moving away from the anode. If we take an electrochemical cell as an example, anode can be remembered as the electrode where anions in the electrolytic solutions are attracted. However, for the study purpose and for our easiness, we can remember anode and cathode in relation to their functions, not the structure.Īnode is the terminal where current flows-in from outside. However, for non-rechargeable batteries and light emitting diodes, the anodes and cathodes are permanent. For example, when a rechargeable battery is charged, the positive terminal is the anode, but when the same battery is discharged, cathode becomes the positive terminal. According to the circumstances, an electrode once functioned as a cathode can change to work as an anode. In some equipments, we cannot surely say one as the anode and the other as the cathode. Anode and cathode are defined by this current flow. ‘Current-out’ means current is flowing out of the system. For a device, when we say ‘current-in,’ that means the current is flowing into the system. When the electrons are flowing to one direction, we say current is flowing to the opposite direction to the electrons. In other words, current is carried by moving electrons. When a current is flowing, negatively charged electrons are flowing. Electrochemical cells, cathode ray tubes, and X-ray tubes are some examples where we come across anodes and cathodes. Anode and cathode are necessary for electrical set ups where current flow is involved.
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