In series  LCR circuit in which R=3 ohm.,L=25mH, and C=800 micro F a sinusoidal a.c voltage of peak value 250v is applied.Find 
(i)frequency at which resonance occurs.
(ii)current in the circuit at resonant condition.
 

(a) Resonance frequncy will be ω=1LC =125×10-3×800×10-6= 12×10-5=223.60 rad/s(b)At resonance the maximum current will be I= 250/3 = 83.3 A.

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