An kittle is rated 1.5k.w ,230v takes 5minutes to bring 1kg of water to boiling from 15℃. find the efficiency of kittle.
Answers
Answered by
5
Explanation:
Given the power rating of the electrical kettle
P
=
2.1
k
W
If time taken to raise the temperature of 1 kg of water from
20
∘
→
100
∘
C
is t sec, then the electrical energy required for this will be
=
P
t
=
2.1
t
k
J
Again the heat energy reqired to raise the temperature of 1 kg of water from
20
∘
→
100
∘
C
is
1
×
4200
×
(
100
−
20
)
J
=
336
K
J
So
2.1
t
=
336
⇒
t
=
336
2.1
=
160
s
=
2 min 40 sec
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