How long will it take to heat 3 kg of water from 28oC to 88oC in an electric taking a current of 6 A from an e.m.f. source of 220V?

A. 96s
B. 1.20s
C. 570s
D. 600s
E. 1200s

Correct Answer: Option C

C. 570s

Explanation

Ivt = mcΔθ
t =
mcΔθ/Iv
=
3x 4200 x (88 – 28)/6 x 200