How long will it take to heat 3kg of water from 28oC to 88oC in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg-1K-1]
-
A.
120s -
B.
570s -
C.
600s -
D.
836s
Correct Answer: Option B
Explanation
t = (frac{mctheta}{IV} = frac{3 times 4189 times 60}{6 times 120} = 570s)