2006-11-16 05:36:51 · 3 answers · asked by Noel K 1 in Science & Mathematics ➔ Engineering
exhalation re peers.
2006-11-16 05:39:20 · answer #1 · answered by Anonymous · 0⤊ 0⤋
For bipolar transistors, Alpha is the ratio of the collector current to the emitter current. Since the emitter current has to supply the base current also, less than 100% reaches the collector. That is the collector current is the emitter current minus the base current.
Since collector current is alpha time emitter current AND
base current is emitter current times (1 - alpha) if you rearrange terms, you find the collector current is alpha/(1-alpha) which has to be greater than one for an alpha close to one. If you want the physics behind it all, open a book.
2006-11-16 05:46:45 · answer #2 · answered by Gene 7 · 0⤊ 0⤋
Hi. It has to do with the measurement of gain. See : http://www.tpub.com/neets/book7/25f.htm
Alpha equals (beta divided by beta plus one). Alpha will therefore always be less than 1.
2006-11-16 05:42:20 · answer #3 · answered by Cirric 7 · 0⤊ 0⤋