In a common emitter transistor amplifier the audio signal voltage across the collector is 3V- The resistance of collector is 3 k- If current gain is 100 and the base resistance is 2 k- the voltage and power gain of the amplifier is

Current gain, β = 100 Voltage gain, A_v = βR_c/R_b = 100 ×3/2 = 150 Power gain = A_v β = 150 × 100 = 15000 ...

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Standard XII

Physics

Transistor as an Amplifier

In a common e...

Question

In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is $3 k Ω$ . If current gain is 100 and the base resistance is $2 k Ω$ , the voltage and power gain of the amplifier is

15 and 200

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150 and 15000

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20 and 2000

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200 and 1000

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Solution

The correct option is B
150 and 15000

Current gain, $β = 100$
Voltage gain, $A_{v} = β \frac{R_{c}}{R_{b}} = 100 \times \frac{3}{2} = 150$
Power gain = $A_{v} β = 150 \times 100 = 15000$

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In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2 kΩ, the voltage and power gain of the amplifier is

The correct option is B 150 and 15000 Current gain, β=100 Voltage gain, Av=βRcRb=100×32=150 Power gain = Avβ=150×100=15000

In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is $3 k Ω$ . If current gain is 100 and the base resistance is $2 k Ω$ , the voltage and power gain of the amplifier is

The correct option is B
150 and 15000

Current gain, $β = 100$
Voltage gain, $A_{v} = β \frac{R_{c}}{R_{b}} = 100 \times \frac{3}{2} = 150$
Power gain = $A_{v} β = 150 \times 100 = 15000$