Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]
-
A.
4.57 minutes -
B.
5.02 minutes -
C.
7.30 minutes -
D.
10.04 minutes
Correct Answer: Option A
Explanation
t = (frac{MCtheta}{2} = frac{1.5 times 4200 times 50}{5 times 230})
= 273.91s or 4.57 mins