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New design prolongs the lifespan of plasma torches

Thanks to a new design contributed by a research team led by Prof. Zhao Peng from Hefei Institutes of Physical Science (HFIPS) of Chinese Academy of Sciences (CAS), the operation time for plasma torch gas been extended from ...

Cathode

A cathode is an electrode through which electric current flows out of a polarized electrical device. Mnemonic: CCD (Cathode Current Departs).

Cathode polarity is not always negative. Although positively charged cations always move towards the cathode (hence their name) and/or negatively charged anions move away from it, cathode polarity depends on the device type, and can even vary according to the operating mode. In a device which consumes power, the cathode is negative, and in a device which provides power, the cathode is positive:

An electrode through which current flows the other way (into the device) is termed an anode.

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