EEE/ETI 1202
CIRCUITS & NETWORK THEORY I
LECTURE 9
, Series Resonance
• An a.c. circuit containing reactive elements (L and C) is said to be in resonanc
when the circuit power factor is unity.
• Resonance means to be in step with. When applied voltage and circuit current i
an a.c. circuit are in step with (i.e. phase angle is zero or p.f. is unity), the circuit
said to be in electrical resonance.
• If this condition exists in a series a.c. circuit, it is called series resonance. On th
other hand, if this condition exists in a parallel a.c. circuit, it is called parall
resonance. The frequency at which resonance occurs is called resonant frequenc
(fr).
CIRCUITS & NETWORK THEORY I
LECTURE 9
, Series Resonance
• An a.c. circuit containing reactive elements (L and C) is said to be in resonanc
when the circuit power factor is unity.
• Resonance means to be in step with. When applied voltage and circuit current i
an a.c. circuit are in step with (i.e. phase angle is zero or p.f. is unity), the circuit
said to be in electrical resonance.
• If this condition exists in a series a.c. circuit, it is called series resonance. On th
other hand, if this condition exists in a parallel a.c. circuit, it is called parall
resonance. The frequency at which resonance occurs is called resonant frequenc
(fr).
