Three amplifiers are connected in series, (cascaded). The first amplifier has voltage gain of 5, second has voltage gain of 10 and 3rd has voltage gain of 20. If the input signal is 0.1 V, then the final output of AC signal will be
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 100 V
In cascaded amplifiers the output of one stage is the input of the next, so the total voltage gain is the product of the individual gains.
\( \displaystyle A = A_{1} \times A_{2} \times A_{3} = 5 \times 10 \times 20 = 1000 \)
\( \displaystyle V_{\mathrm{out}} = A\,V_{\mathrm{in}} = 1000 \times 0.1\,\mathrm{V} = 100\,\mathrm{V} \)