In Chapter 24, we started our study of the BJT NPN transistor. We noted that what the transistor actually amplified was current, so that the current coming into the collector was a multiple (known as β) of the current coming into the base.
I will warn you that the calculations are pretty ugly (which is why they are in the appendix). Also, to fully understand what is happening, you need to read the rest of this chapter through Chapter
26.
The reason for this is that the formula itself was made by making a
lot of assumptions and simplifications. Those don’t always hold in the real world, so you have to make adjustments.
