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Class 12 NEET Physics Current Electricity Questions Part 1
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© examsnet.com
Question : 33
Total: 100
An electric kettle takes 4 A current at
220
V
. How much time will it take to boil
1
k
g
of water from temperature
20
°
C
? The temperature of boiling water is
100
°
C
.
(2008)
12.6
m
i
n
4.2
m
i
n
6.3
m
i
n
8.4
m
i
n
Validate
Solution:
Power
=
220
V
×
4
A
=
880
w
a
t
t
s
=
880
J
∕
s
Heat needed to raise the temperature of
1
k
g
water through
80
°
C
=
m
s
.
Δ
T
×
4.2
J
∕
c
a
l
=
1000
g
×
1
c
a
l
∕
g
×
80
×
4.2
J
∕
c
a
l
∴ Time taken
=
1000
×
1
×
80
×
4.2
880
=
336
×
10
3
880
=
382
s
=
6.3
m
i
n
© examsnet.com
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