Calculate the base current ib from 9 v - vberb describe

Question

Module Lab Exercise: Determine Beta for BJTs

Wire the circuit shown, with R_c = 470 ? and Q = 2N3904

? Record I_b and I_c in the table below for the given values of R_B

? Calculate the base current I_B from (9 V - V_be)/R_B

RB	Ib	Ic	Vbe	Vce	Beta
1M?
470K?
200K?
100K?
47K?

? Start with RB = 1 Mohm, then continue with the RB values.

(A) Squeeze the transistor between your fingers to raise the case temperature, record any change in collector current.

(B) Put a piece of ice in a plastic bag and hold it on the transistor to reduce the case temperature, record any change in collector current.

? Describe your perception of the relationship between Beta and case temperature.
? Describe the behavior of Beta vs I_c.