Question on: WAEC Physics - 1994
Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200(kg^{-1}K{-1})
A
2.5 minutes
B
5.7 minutes
C
6.7 minutes
D
7.5 minutes
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Correct Option: C
t = (\frac{mc\theta}{p}= \frac{2\times4200\times50}{210\times5} \ = 400s = 6.7)
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