How long does it take a 750W heater to raise th... - JAMB Physics 1991 Question
How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]
A
84s
B
112s
C
168s
D
280s
Ask EduPadi AI...
Correct Option: C
Heat energy = Elect. energy
mc(\theta) = power x time
1 x 4200 x (50 - 20) = 750 x t
t = 168s
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