7
Phasor diagram and impedance triangle.
Calculate (a) the reactance the capacitor, (b) the impedance the circuit and (c) the
current.15H connected series with resistor across 100V 50Hz supply.142 0.46A
∴
Ω
Example 2
A 60μF capacitor connected series with 100Ω resistor across 230V supply.
VL
VC
VT
VR R
VR IR
VT IZ
Z
IXC
R
IZ
IXL
XL
Z
XC
(a) (b) (c)
(a) (b) (c)
For inductive circuit
For capacitive circuit
FIGURE 10.1 68.15 47.
For (a):
X fL
X
L
L
2 )
2 3.69
1.Baisc Electrical Installation Work
200
Example 1
A coil 0. Calculate
(a) the reactance the coil, (b) the impedance the circuit and (c) the current.69
Ω
∴ Ω
For (c):
I
V
Z
I
V
(A)
100
68.1
π
∴
Ω
Ω
For (b):
Z X
Z
2
2 2
( )
(50 (47.
