causes the current the cir-
cuit lag behind the applied voltage. From
Ohm’s law:
R
V
I
R
R
( )
Ω
Definition
In any circuit, resistance defined as
opposition current flow.2
Voltage and current relationships resistive, capacitive and inductive circuits.c.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. current inductive
circuit.
Definition
Inductive reactance (XL) the opposi-
tion a. 10.Alternating current theory and electrical machines
195
Resistance
In any circuit, resistance defined opposition current flow. causes the current the circuit lag behind the applied voltage,
as shown Fig.
.c. current inductive
circuit. circuit, resistance only part the opposition cur-
rent flow.2. circuit also cause an
opposition current flow, which call reactance.
However, a. given the formula:
X fL
L Ω
where
π 3.c.
Inductive reactance (XL) the opposition a. The inductance and capacitance a
