from The Century Dictionary.

  • noun In electricity, a resistance placed, for purposes of regulation, in series with the filament of an electric lamp. In the case of the Nernst lamp the ballast consists of a very fine iron wire in an atmosphere of hydrogen within a sealed glass tube.


Sorry, no etymologies found.


  • This was due to the common dimensions of the T8 lamp and the simplicity of a lamp-ballast swap.

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