2
Ω
For inductive reactance:
X fL
L 2π
where 50Hz and 0.
∴ 6
1
2 3.2.c.
It can also expressed as:
X
V
I
C
C
C
Definition
Capacitive reactance (XC) the oppo-
sition a.c.7
Impedance
The total opposition current flow a.
Example
Calculate the reactance 150μF capacitor and 0. given the formula:
X
fC
C )
1
2π
Ω
where and are defined before and the capacitance the circuit.
For capacitive reactance:
2
C
X
fC
1
π
where 50Hz and 150μF 150 106
F. causes the current the circuit lead ahead the voltage,
as shown Fig. circuit called impedance and
given the symbol Z. current capaci-
tive circuit.
∴ Ω
XL 3. 10.142 50Hz 0.05H. causes the current the cir-
cuit lead ahead the voltage.05H inductor they were separately
connected the 50Hz mains supply. circuit called impedance
and given the symbol Thus impedance the combined opposition to
current flow the resistance, inductive reactance and capacitive reactance
of the circuit and can calculated from the formula:
Z )
Ω
or
Z
V
I
T
T
Definition
The total opposition current flow in
an a.c.142 50Hz 150 F
21.c.05H 15. current capacitive
circuit.
.Baisc Electrical Installation Work
196
Capacitive reactance (XC) the opposition a
