A battery

A battery

noun Electronics.
an electric battery for heating the filament or cathode heater of an electron tube.


Origin:
1920–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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A battery is always a great word to know.
So is capacitive time constant. Does it mean:
when voltage and current reach maximum values at the same time
time taken for charge to decay to 1 over the natural logarithm of its initial value
WordNet
a battery

noun
the battery used to heat the filaments of a vacuum tube 
WordNet® 3.0, © 2006 by Princeton University.
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