an electric battery for supplying a constant, positive voltage to the plate of a vacuum tube.
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How to use B battery in a sentence
Worst of all, if you accidentally reversed the A and B battery connectors, you could fry your radio's precious tubes.
When the B battery is connected, it puts a positive charge on the plate of the tube.
The negative terminal of the B-battery is connected to the filament.
Now, suppose that the B-battery takes away 100 of these each second.
Of course, as long as the switch in the B-battery is open no current can flow.
The B-battery will want to take in electrons at its positive terminal and to send them out at its negative terminal.
In the plate-filament circuit we connect the B-battery and a switch, S, and another coil.