Current Electricity Charging Discharging Of Capacitors Question 96
Question: An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature $ 20{}^\circ C $ ? The temperature of boiling water is $ 100{}^\circ C $
[RPET 1996]
Options:
A) 6.4 minutes
B) 6.3 minutes
C) 12.6 minutes
D) 12.8 minutes
Show Answer
Answer:
Correct Answer: B
Solution:
Electric power consumed by kettle $ P=220\times 4,W $ Heat required $ H=1000\times 1,(100-20)=1000\times 80cal $
$ =4200\times 80J $
$ P=\frac{H}{t}\Rightarrow ,H=P\times t $ \ $ 220\times 4\times t=4200\times 80 $
Therefore $ t=6.3 $ minutes
BETA
