<p>A series LCR-circuit with R = 20<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#937;</mi></math>, L = 2 H and C = 50<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#956;</mi></math>F is connected to a 200 volts ac source of variable frequency. What is (i) the amplitude of the current, and (ii) the average power transferred to the circuit in one complete cycle, at resonance? (iii) Calculate the potential drop across the capacitor.</p>