The collector supply voltage is 6 V and a voltage drop across a resistor of 600Ω in the collector circuit is 0.6 V , in a circuit of transistor connected in common emitter mode. If the current gain is

Question

The collector supply voltage is 6 V and a voltage drop across a resistor of 600Ω in the collector circuit is 0.6 V , in a circuit of transistor connected in common emitter mode. If the current gain is 20 then the base current is

TestHub · Accepted Answer

The voltage drop across the collector resistor is given by $V_{C} = I_{C} R_{C}$ .

Substituting the given values, we get:

$0.6 = I_{C} \times 600$

$I_{C} = \frac{0.6}{600} = 1 0^{- 3} A = 1 mA$

The current gain in common emitter mode is $β = \frac{I _{C}}{I _{B}}$ .

Substituting $β = 20$ and $I_{C} = 1 mA$ :

$20 = \frac{1 mA}{I _{B}}$

$I_{B} = \frac{1}{20} mA = 0.05 mA$

Answer: 0.05 mA

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