Question 55 TCO 6 An AC RLC parallel circuit consists of R

Question 5.5. (TCO 6) An AC RLC parallel circuit consists of R = 400 , L = 100 mH and C = 2 F. The circuit input impedance at resonance is _______.

(Points : 4)

a. 0 ohms

b. 400 ohms

c. inf ohms

d. Negative reactance

Solution

Atb resonance the circuit impedance consists of resistive part and Xl+Xc =0 and Z=r+i(Xl+Xc) =r

so total impedance at resonance is Z=r =400 ohm