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Standard XII
Physics
Forward Bias
The virtual c...
Question
The virtual current of 4A and 50Hz flows in an accident circuit . The power consumed is 240W if the virtual voltage across the coil is 100V ,then it's resistance will be
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Q.
When
100
V
dc is applied across a coil, a current of
1
A
flows through it and when
100
V
ac of
50
H
z
is applied to the same coil, only
0.5
A
flows.
The inductance of coil is
Q.
An alternating voltage
V
=
V
0
sin
(
ω
t
)
is applied across a circuit. As a result, a current
I
=
I
0
sin
(
ω
t
−
π
/
2
)
flows in it. The power consumed per cycle is
Q.
An electric lamp which runs at
100
V
dc and consumes
10
A
current is connected to ac mains at
150
V
,
50
H
z
cycles with a choke coil in series. The inductance of voltage across the choke is given as
x
×
10
−
3
H
.Find
x
Neglect the resistance of choke.
Q.
A circuit, containing an inductance and a resistance connected in series, has an AC source of
200
V
,
50
Hz
connected across it. An AC rms current of
10
A
flows through the circuit and the power loss is measured to be
1
kW
. Then
Q.
Voltage applied to an
A
C
circuit and current flowing in it is given by
V
=
200
√
2
sin
(
ω
t
+
π
4
)
and
i
=
−
√
2
cos
(
ω
t
+
π
4
)
The power consumed in the circuit will be
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