Question

At the resonant frequency, the current is high if the resistance is:

Answer 1

In LCR Circuit The resistor is not frequency dependent. It will behave same for AC or DC

The L and C are frequency dependent .

The impedance X(L) = 2*pi*f* L ; Therefore , if f increases X[L] increases .

The impedance X[C] = 1/(pi*f* C) ; Therefore if f increases X[C] decreases

The net impedance is in a LCR series circuit is Z = R + X[L] + X[C] ;

Since X[L] and X[C] are varying the current will be varying . The Value of X[C] is negative; Hence at some specific frequency called Resonance X[L] + X[C] = 0 and and only R remains and hence the current will be maximum

In a similar pattern in LCR parallel circuit the current will be minimum in Resonance