Static current amplification:

Current amplification is often called as beta.  It can range from a factor of a few times up to hundreds of times. One method of expressing beta of the transistor is as static forward current transfer ratio, abbreviated HFE. Mathematically, it can be given as

H_FE = I_C/I_B

Therefore, if a base current, IB, of 1 mA results in the collector current, I_C, of 35 mA, H_FE =35/1=35. If I_B =0.5 mA yields I_C =35 mA, then H_FE =35/0.5 = 70.

This definition represents greatest current amplification possible with the given transistor.