Question

For a given transistor circuit, the base current is $10\mu A$ and collector current is 5.2 mA. Find $V_{BE}$ and $V_{CE}$

• A. 0.5 V and 0.3 V
• B. 0.3 V and 0.5 V
• C. 0.4 V and 0.4 V
• D. 0.2 V and 0.6 V

Answer 1

Answer: (A)

0.5 V and 0.3 V

The input voltage, $V_i=5.5\text{Volt}$

The base voltage,

$V_B=I_B.R_B$

$V_B=\left(10\mu A\right).\left(500k\Omega \right)$

$V_B=\left(10\times {10}^{-6}A\right).\left(500\times {10}^3\Omega \right)=5\text{Volt}$

So, $V_{BE}=V_i-V_B=\left(5.5-5\right)=0.5\text{Volt}$

The collector voltage,

$V_C=I_C.R_C$

$V_C=\left(5.2mA\right).\left(1k\Omega \right)$

$V_C=\left(5.2\times {10}^{-3}A\right).\left(1\times {10}^3\Omega \right)=5.2\text{Volt}$

So, $V_{CE}=V_i-V_C=\left(5.5-5.2\right)=0.3\text{Volt}$