i have never figured that out !
2007-03-24 02:25:39 · 6 answers · asked by xof 1 in Consumer Electronics ➔ Other - Electronics
A long long time ago, when radios were first becoming popular using vacuum tube technology, they used "B" batteries for the "plate" circuits of the vacuum tubes. Typically these "B" batteries were high voltage. (45 volts and more) The "A" batteries operated the "filaments" of the vacuum tubes and were low voltage types. Today, there is not much need for "B" batteries as vacuum tube electronic equipment is scarce, and battery operated vacuum tube electronic devices even rarer.
2007-03-24 03:00:06 · answer #1 · answered by Saturn 5 4 · 1⤊ 0⤋
For the same reason that AA,AAA,C and D batteries all have the same voltage 1.5
Somethings just plain don't make sense
Maybe it is just so that batt. companies can get more money by selling different sizes of batteries rather than creating a universal battery that could work with everything.
2007-03-24 02:34:28 · answer #2 · answered by firephotodude 3 · 0⤊ 1⤋
Yes we do have B batteries. These are obselete batteries but still exist. B batteries were used in the early days to provide higher-voltage DC from 22.5 to 90 volts for the plates of vaccum tubes of battery-powered tube radios.
2007-03-24 03:16:02 · answer #3 · answered by Boo L 3 · 1⤊ 0⤋
Maybe it just doesn't seem right since batteries start with a B. I don't know. But I do know why we have different sizes. They may have the same voltage, but not the same amperage. D batteries will last longer than the other ones when powering the same thing. But they are pretty big so it can be a little inconvenient.
2007-03-24 02:38:25 · answer #4 · answered by ih8u 3 · 0⤊ 1⤋
We used to have B Batteries. They were used in tube type radios.
2007-03-24 02:37:25 · answer #5 · answered by istitch2 6 · 1⤊ 0⤋
Umm, there is B. They're the big square ones with the coils for connectors. Usually used in like camping lanterns.
2007-03-24 02:35:14 · answer #6 · answered by buccaneersden 5 · 0⤊ 1⤋