AC Components and Circuits
RLC Circuit Analysis
Section 8-1 Series RLC Circuits
Series RLC Circuit
When XL is greater than XC, the phase is positive.
When XL is less than XC, the phase is negative
When XL = XC the impedance (ZT) is the same as R, and there is no phase angle.
Procedure Analysis of a series RLC circuit, given the values of VT, XL, XC, and R
Step 1: Calculate the total impedance
Step 2 Calculate the total current
Step 3 Determine the current for each component
IR = IL = IC = IT
Step 4 Calculate the voltage for each component
- VR = IT x R
- VL = IT x XL
- VC = IT x XC
Step 5 Determine the phase angle for each component and the total phase angle
- qR = 0º
- qL = –90º
- qC = 90º
Endless Examples & Exercises
When VL is greater than VC, the phase is positive.
When VL is less than VC, the phase is negative
When VL = VC the voltage across the resistor (VR) is dental to the source voltage VT)
Voltage phasors for RLC circuits are identical to those for impedance.
The special point where where the reactances are equal (and the reactive voltage is zero