Basic AC Reactive Components
IMPEDANCE
IMPEDANCE
Whenever inductive and capacitive components are used in an AC
circuit, the calculation of their effects on the flow of current is
important.
EO 1.9
DEFINE impedance (Z).
EO 1.10
Given the values for resistance (R) and inductance (L)
and a simple R-L series AC circuit, CALCULATE the
impedance (Z) for that circuit.
EO 1.11
Given the values for resistance (R) and capacitance (C)
and a simple R-C series AC circuit, CALCULATE the
impedance (Z) for that circuit.
EO 1.12
Given a simple R-C-L series AC circuit and the values
for resistance (R), inductive reactance (XL), and
capacitive reactance (XC), CALCULATE the impedance
(Z) for that circuit.
EO 1.13
STATE the formula for calculating total current (IT) in
a simple parallel R-C-L AC circuit.
EO 1.14
Given a simple R-C-L parallel AC circuit and the values
for voltage (VT), resistance (R), inductive reactance (XL),
and capacitive reactance (XC), CALCULATE the
impedance (Z) for that circuit.
Impedance
No circuit is without some resistance, whether desired or not. Resistive and reactive components
in an AC circuit oppose current flow. The total opposition to current flow in a circuit depends
on its resistance, its reactance, and the phase relationships between them. Impedance is defined
as the total opposition to current flow in a circuit. Equation (8-6) is the mathematical
representation for the magnitude of impedance in an AC circuit.
(8-6)
Z
R2
X2
Rev. 0
Page 9
ES-08
