In a BJT
where β = current gain = \(\frac{I_C}{I_B}, \) α = current ratio = \(\frac{I_C}{I_E}, \)
1
\(\beta = \frac{\alpha}{1 + \alpha}\)
2
\(\alpha = \frac{\beta}{\beta - 1}\)
3
\(\beta = \frac{\alpha}{1 - \alpha}\)
4
\(\alpha = \frac{\beta + 1}{\beta}\)