calculate alpha DC (emitter to collector dc current gain) and beta DC (base to collector dc curent gain) for a transistor which has Ic=2.5ma, Ie=2.6ma . formula 1) alpha DC=Ic/Ie. formula 2) beta DC =Ic/Ib. formula 3) beta DC = alpha DC/(1-alpha DC) formula 4) Ib=Ie-Ic alpha dc=Ic/Ie =2.5/2.6 =0.96 Ib=Ie-Ic =2.6-2.5 =0.1ma using formula 2) beta DC =Ic/Ib =2.5/0.1 =25 using formula 3) beta DC = alpha DC/(1-alpha DC) = 0.96/(1-0.96) =24 my doubt is, from above calculation for beta DC using formula 2 and 3 we are getting two different values for beta DC. so which one is correct and under which condition or how i should use these two formula? In the sense when i should use formula 2 and formula 3. advanced thanks
You should get the same answer. If you round beta DC to 5 decimal places you will get the same answer.
I think it's a problem with alpha rounding, not with beta rounding. Beta is 25.0000, so rounding isn't an issue.