question_answer 17)

Keeping the source frequency equal to the resonating frequency of the series LCR circuit, if the three elements. L, C and R are arranged in parallel, show that the total current in the parallel LCR circuit is minimum at this frequency. Obtain the current rms value in each branch of the circuit for the elements and source specified in Exercise 7.11 for this frequency. 

Answer:

In case of parallel LCR circuit, impedenceis given by,                 At resonance frequency is minimum i.e. Z is maximum or current is minimum.                 In resistor                 In inductor                                 In capacitor                                                 Total current                 (andare out of phase at every instant, so they add up to zero)