Question: An electric circuit, whether its a simple lightbulb or a complex amplifier, has two input terminals that are connected to the two output terminals of
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 a large input impedance. To see why, suppose you need to amplify the output of a high-pass filter that is constructed with a 1.2 kΩ resistor and a 15 μF capacitor. The amplifier you’ve chosen has a purely resistive input impedance. For a 60 Hz signal, what is the ratio VR load/VR no 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) 1.5 kΩ
(b) 150 kΩ?
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