active material

Definitions

Electronics

  • In a storage cell or battery, the substance which participates in the electrochemical reactions of charge or discharge. lead oxide is an example.
  • In a CRT, the fluorescent coating on the screen. An example is zinc phosphate.
  • In an electron tube, the material coating the cathode. thorium oxide is an example.
  • A radioactive material, an example of which is radium.
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