Here's a question from my homework:
Find \$ I_C \$ and \$ V_{CE} \$ for the circuits below, assuming \$ |V_{BE}| = 0.7V \$ and \$ \beta = 100 \$.
I understand circuit (a), but for (b), I don't understand how to incorporate the \$ -15V \$ branch into calculation.
Below is my attempt:
$$ R_{TH} = \frac {R_1 R_2} {R_1 + R_2} = 3.197 \times 10^5 \Omega $$
$$ V_{TH} = \frac {V_1 R_2 + V_2 R_1} {R_1 + R_2} = 5.408 V $$
$$ \therefore I_B = \frac{V_{TH} - V_{BE}} {R_{TH}} = 1.47 \times 10^{-5} A $$
$$ I_C = \beta I_B = (100) (4.69 \times 10^{-5}) = 1.47 mA $$
Edit: Thank you all so much for the helppppppppp~
