An electric heater rated 220v 1000 w is immerse... - JAMB Physics 2009 Question
An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg-1 K-1]
[specific heat capacity of water = 4200 jkg-1 K-1]
A
4.28 kg
B
42.86 kg
C
1.02 kg
D
7.14 kg
correct option: c
Energy supplied bythe heater = heater gained by water
pt = MCAθ
1000 x 300 = m x 4200(100 - 30)
m = (1000 x 300)/4200 x 70 = 1.02 kg
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