The lower and upper end of the band width of a series RLC circuit is where the current has fallen to of the maximum.
A) 70.7%
B) 63.6%
C) 29.3%
D) 50%

Question

Quizplus · Accepted Answer

The lower and upper end of the bandwidth of a series RLC circuit is defined by the points where the current has fallen to 70.7% of its maximum value. This corresponds to the points where the impedance of the circuit is at its minimum (resonant frequency) and the voltage and current are in phase. The 70.7% figure is derived from the fact that at these points, the power is half of its maximum value, which corresponds to the -3 dB points in filter terminology.

The Lower and Upper End of the Band Width of a Series