In an RC filter circuit, the cutoff frequency is defined as the frequency at Which:
A) the output voltage drops to 70% of maximum.
B) the output voltage is cutoff, with minimum or zero output.
C) the output voltage drops to 66% of maximum.
D) the output voltage drops to 33% of maximum.

Question

Quizplus · Accepted Answer

The cutoff frequency in an RC filter circuit is the frequency at which the output voltage drops to 70.7% (or approximately 70%) of the maximum input voltage. This occurs because at higher frequencies, the capacitor in the circuit becomes a short circuit, effectively bypassing the resistor and reducing the output voltage. Therefore, Option A is the correct answer.

In an RC Filter Circuit, the Cutoff Frequency Is Defined