7
Impedance
The total opposition current flow a.
Example
Calculate the reactance 150μF capacitor and 0.
It can also expressed as:
X
V
I
C
C
C
Definition
Capacitive reactance (XC) the oppo-
sition a.2.Baisc Electrical Installation Work
196
Capacitive reactance (XC) the opposition a.
.
For capacitive reactance:
2
C
X
fC
1
π
where 50Hz and 150μF 150 106
F. 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.05H. given the formula:
X
fC
C )
1
2π
Ω
where and are defined before and the capacitance the circuit.05H inductor they were separately
connected the 50Hz mains supply.c. current capacitive
circuit.
∴ Ω
XL 3. causes the current the circuit lead ahead the voltage,
as shown Fig. circuit called impedance and
given the symbol Z.2
Ω
For inductive reactance:
X fL
L 2π
where 50Hz and 0. current capaci-
tive circuit. 10.05H 15.
∴ 6
1
2 3.c.c.142 50Hz 150 F
21.142 50Hz 0.c. causes the current the cir-
cuit lead ahead the voltage
