# IE = (1 + β)IB ≈ βIB ≈ IC What does the (1+β) mean?

Discussion in 'General Electronics Chat' started by ninjaman, Aug 28, 2016.

1. ### ninjaman Thread Starter Member

May 18, 2013
307
1
Hello,
I have been studying transistors recently and have seen this a few times.
IE = (1 + β)IB ≈ βIB ≈ IC

What does the 1+B mean, where does the 1 come from?
Is it something glaringly obvious because I have missed it. It isn't written in the text, does that matter or is it one of those things that you just except.
Thanks
Simon

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2. ### Veracohr Well-Known Member

Jan 3, 2011
662
100
Ie=Ib+Ic

If Ic=Ib*beta, then Ic+Ib=Ib*beta+Ib, which is rewritten as (1+beta)*Ib.

3. ### dl324 AAC Fanatic!

Mar 30, 2015
7,440
1,766
Saying it in a different way:
$\small I_E = I_{B} + I_C = I_B + \beta I_B = (1+\beta) I_B$

4. ### SLK001 Senior Member

Nov 29, 2011
1,185
440
It's beta, or hfe. These terms should be in your lessons.

5. ### ninjaman Thread Starter Member

May 18, 2013
307
1
ignore this, i did the math, something i am not good at.
thanks for the help
simon

Last edited: Aug 28, 2016