Chapter 32, Problem 21EAP

An electric circuit, whether it’s a simple lightbulb or a complex amplifier, has two input terminals that are connected to the two output terminals of the voltage source. The impedance between the two input terminals (often a function of frequency) is the circuit’s input impedance. Most circuits are designed to have large input impedance. To see why, suppose you need to amplify the output of a high-pass filter that is constructed with a $\text{1}.\text{2 k}\Omega$ resistor and a $15\mu \text{F}$ capacitor. The amplifier you’ve chosen has a purely resistive input impedance. For a $\text{6}0\text{ Hz}$ signal, what is the ratio $V_{\text{R}}{}_{\text{load}}/V_{\text{R}\text{no}\text{load}}$of the filter’s peak voltage output with (load) and without (no load) the amplifier connected if the amplifier’s input impedance is (a) $\text{1}.\text{5 k}\Omega$ and (b) $\text{15}0\text{ k}\Omega$ ?