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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.
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Total voltage gain, $\mathrm{A}_{\mathrm{V}}=\frac{\Delta \mathrm{V}_0}{\Delta \mathrm{V}_{\mathrm{i}}}=\mathrm{A}_{\mathrm{V}_1} \times \mathrm{A}_{\mathrm{V}_2}$ or $\Delta \mathrm{V}_0=\Delta \mathrm{V}_{\mathrm{i}} \times \mathrm{A}_{\mathrm{V} 1} \times \mathrm{A}_{\mathrm{V} 2}=0.01 \times 10 \times 20=2 \mathrm{~V}$.
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