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JEE Main Physics Class 12 Current Electricity Part 1 Questions
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Question : 54
Total: 100
Two electric bulbs rated 25W – 220 V and 100W – 220V are connected in series to a 440 V supply. Which of the bulbs will fuse?
[2012]
Both
100 W
25 W
Neither
Validate
Solution:
Current capacity of
25
W
bulb
I
1
=
W
1
V
1
=
25
220
Amp
Current capacity of
100
W
bulb
I
2
=
W
2
V
2
=
100
220
Amp
The current flowing through the circuit
Resistance of
25
W
bulb,
R
1
=
V
1
2
P
1
=
(
220
)
2
25
Resistance of
100
W
bulb
R
2
=
V
2
2
P
=
(
220
)
2
100
R
eff
=
R
1
+
R
2
Current flowing through circuit
I
=
440
R
e
f
f
I
=
440
(
220
)
2
25
+
(
220
)
2
100
=
440
(
220
)
2
[
1
25
+
1
100
]
;
I
=
40
220
Amp
∵
I
1
(
=
25
220
A
)
<
I
(
=
40
220
A
)
$
Thus the bulb rated
25
W
−
220
will fuse
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