__Inductive Reactance:__

It
is the opposition to the current flow in an AC circuit that contain only
inductance element and we refer to it by the symbol (XL). If the circuit
contains resistance and reactance, the total opposition to the current flow
called impedance and we refer to it by the symbol (Z).

When
an AC current passes throw an inductance, counter EMF is generated and trying
to oppose changes in the current. This opposition is called inductive reactance
(XL).

Inductive
reactance is measured in ohm and proportional to the value of inductance and
the value of the applied frequency according to the following formula:

XL =
2 π F L where π = 3.14,
L =value of inductor in henry.

Z = √
(R

^{2}+XL^{2 })
Phase relationship between applied voltage and current:

In
pure resistive load, current and voltage are in phase (angle = 0) and in pure
inductive load, the current lag the voltage by an angle equal to 90 degree and
it said to be out of phase. In a circuit contain inductive reactance and
resistance the current will lag the voltage by an angle in between (0) degree
and (90) degree depending on the ratio between the amount of inductive
reactance components to resistive components, as the more resistive component
the more in phase relationship and vice versa.

Capacitive Reactance:

It
is the opposition to the current flow in an AC circuit that contain only
capacitive element and we refer to it by the symbol (XC). If the circuit
contains resistance and capacitance, the total opposition to the current flow
called impedance and we refer to it by the symbol (Z).

Capacitive
reactance is measured in ohm and it increases when the value of capacitor
capacitance decreased according to the following formula:

XC =1
/ (2π F C) where π = 3.14, C = value of capacitance in farad.

Z = √
(R

^{2}+XC^{2 })
Phase relationship between applied voltage and current:

In
pure capacitive load, current lead voltage by an angle equal to 90 degree and
it said to be out of phase. In a circuit contain capacitive reactance and
resistance, the current will lead the voltage by an angle in between (0) degree
and (90) degree depending on the ratio between the amount of capacitive
reactance components to resistive components as the more resistive component
the more in phase relationship and vice versa.

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