Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200(kg^{-1}K{-1})
-
A.
2.5 minutes -
B.
5.7 minutes -
C.
6.7 minutes -
D.
7.5 minutes -
E.
9.5 minutes
Correct Answer: Option C
Explanation
t = (frac{mctheta}{p}= frac{2times4200times50}{210times5} \ = 400s = 6.7)