Question

An kittle is rated 1.5k.w ,230v takes 5minutes to bring 1kg of water to boiling from 15℃. find the efficiency of kittle.​

Answer 1

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

hope, it will help you, mark me as brainlist :-) and Thnk my answer, put your questions values and solve the way I had done...., if any problem in calculations use calculator....