.2
Voltage and current relationships resistive, capacitive and inductive circuits. The inductance and capacitance a. given the formula:
X fL
L Ω
where
π 3.142 constant
f the frequency the supply
L the inductance the circuit by
X
V
I
L
L
L
R
Pure resistance
(R)
V and phase lags 90° leads 90°
Pure inductance
(L)
Pure capacitance
(C)
V
V
I
V V
I
I
I
I
L
V
I C
V
I
V V
I I
FIGURE 10.c. 10.Alternating current theory and electrical machines
195
Resistance
In any circuit, resistance defined opposition current flow.c.
Inductive reactance (XL) the opposition a.2. current inductive
circuit.
However, a. circuit, resistance only part the opposition cur-
rent flow. causes the current the cir-
cuit lag behind the applied voltage.
Definition
Inductive reactance (XL) the opposi-
tion a. causes the current the circuit lag behind the applied voltage,
as shown Fig. current inductive
circuit. From
Ohm’s law:
R
V
I
R
R
( )
Ω
Definition
In any circuit, resistance defined as
opposition current flow.c. circuit also cause an
opposition current flow, which call reactance.c
