142 50Hz 150 F
21. current capacitive
circuit. causes the current the cir-
cuit lead ahead the voltage.
Example
Calculate the reactance 150μF capacitor and 0.c.
.05H.Baisc Electrical Installation Work
196
Capacitive reactance (XC) the opposition a.7
Impedance
The total opposition current flow a.c.2.2
Ω
For inductive reactance:
X fL
L 2π
where 50Hz and 0. current capaci-
tive circuit. given the formula:
X
fC
C )
1
2π
Ω
where and are defined before and the capacitance the circuit. 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.
∴ 6
1
2 3. 10.05H inductor they were separately
connected the 50Hz mains supply.
For capacitive reactance:
2
C
X
fC
1
π
where 50Hz and 150μF 150 106
F. circuit called impedance and
given the symbol Z.c.
It can also expressed as:
X
V
I
C
C
C
Definition
Capacitive reactance (XC) the oppo-
sition a.c.05H 15. causes the current the circuit lead ahead the voltage,
as shown Fig.
∴ Ω
XL 3.142 50Hz 0
