How long will it take to heat 3kg of water from 28 o C to
PHYSICS
WAEC 2006
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: B. 570s
Explanation
t = \(\frac{mc\theta}{IV} = \frac{3 \times 4189 \times 60}{6 \times 120} = 570s\)
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