Question

In the circuit shown in figure, when the input voltage of the base resistance is 10 V, V_be is zero and V_ce is also zero. Find the values of I_b, I_c and β.

Answer 1

According to the problem, V_i = 10 V, Resistance, R_B = 400 kΩ, V_BE = 0, V_CE = 0 and R_C = 3 kΩ

`V_i - V_(BE) = R_BI_B`

`I_B = ("Voltage across"  R_B)/R_B`

= `10/(400 xx 10^3)`

= `25 xx 10^-6` A

= 25 μA

Voltage across R_C = 10 V

`V_(CC) - V_(CE) = I_CR_C`

`I_C = ("Voltage across"  R_C)/R_C`

= `10/(3 xx 10^3)`

= `3.33 xx 10^-3` A

= 3.33 mA

β = `I_C/I_B`

= `(3.33 xx 10^-3)/(25 xx 10^-6)`

= `1.33 xx 10^2`

= 133