Circuit Impedance, Z
Circuits Current, I.
Voltages
across the Series RLC Circuit, V
R
, V
L
, V
C
.
Circuits Power factor and Phase Angle, θ.
Phasor Diagram.
Concept of Reactance, Impedance, Susceptance and Admittance:
Reactance
is essentially inertia against the motion of electrons. It
is present anywhere
electric or magnetic fields are developed in proportion to applied voltage or current,
respectively; but most notably in capacitors and inductors. When alternating current goes
through
a pure reactance, a voltage drop is produced that is 90
o
out of phase with the current.
Reactance is mathematically symbolized by the letter “X” and is measured in the unit of
ohms (Ω).
Impedance
is a comprehensive expression of any and all forms of opposition to electron
flow, including both resistance and reactance. It
is present in all circuits, and in all
components. When alternating current goes through an impedance,
a voltage drop is
produced that is somewhere between 0
o
and 90
o
out of phase with the current. Impedance is
mathematically symbolized by the letter “Z” and is measured in the unit of ohms (Ω), in
complex form
Admittance
is also a complex number as impedance which is having a real part,
Conductance (G) and imaginary part, Susceptance (B).
(it is negative for capacitive susceptance and positive for inductive susceptance)
Dostları ilə paylaş: