Question on: WAEC Physics - 2008
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
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Correct Option: A
t = (\frac{MC\theta}{2} = \frac{1.5 \times 4200 \times 50}{5 \times 230})
= 273.91s or 4.57 mins
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