How long will it take to heat 3 kg of water from 28oC to 88oC…

Physics WAEC 1990

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?

  • 96s
  • 1.20s
  • 570s checkmark
  • 600s
  • 1200s

The correct answer is: C

Explanation

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