An anode is an electrode through which conventional current flows into a polarized electrical device. A common mnemonic is ACID for "anode current into device". The direction of electric current is opposite to the direction of electron flow: electrons flow through the anode to the outside circuit.
The polarity of voltage on an anode with respect to an associated cathode varies depending on the device type and on its operating mode. In the following examples, the anode is positive in a device that consumes power, and the anode is negative in a device that provides power.
Tungsten anode is used as a positively charged electrode by which electrons leave an electrical device, and the negatively charged terminal of a voltaic cell or storage battery that supplies current. It is an electrode used together with tungsten cathode as a set to emit electricity. The material of tungsten used as anode can be purity over 99.95%min, and density over 19.0g/cm3 and owns good performance of electricity conductivity.
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