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# Two Amplifiers Are Connected One After the Other in Series (Cascaded). the First Amplifier Has a Voltage Gain of 10 and the Second Has a Voltage Gain of 20. If the Input Signal is 0.01 Volt, Calculate the Output Ac Signal. - CBSE (Science) Class 12 - Physics

ConceptJunction Transistor Transistor as a Device

#### Question

Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.

#### Solution

Voltage gain of the first amplifier, V1 = 10

Voltage gain of the second amplifier, V2 = 20

Input signal voltage, Vi = 0.01 V

Output AC signal voltage = Vo

The total voltage gain of a two-stage cascaded amplifier is given by the product of voltage gains of both the stages, i.e.,

V = V1 × V2

= 10 × 20 = 200

We have the relation:

V = V_0/V_1

V0 = V × Vi

= 200 × 0.01 = 2 V

Therefore, the output AC signal of the given amplifier is 2 V.

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Physics Textbook for Class 12 (2018 to Current)
Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits
Q: 10 | Page no. 510
Solution Two Amplifiers Are Connected One After the Other in Series (Cascaded). the First Amplifier Has a Voltage Gain of 10 and the Second Has a Voltage Gain of 20. If the Input Signal is 0.01 Volt, Calculate the Output Ac Signal. Concept: Junction Transistor - Transistor as a Device.
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