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

By: |Published on: Sep 1|Categories: Physics WAEC| 0 comments

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

Correct Answer:

Option C – 570s

Explanation

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

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