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PHYSICS

JAMB 2009 - Question 21

Physics 2009 JAMB Past Questions - Question 21: An electric heater rated 220 V, 1000W is immersed into a buket full of water . Calculate the mass of water if the temperature changes from 30°C to 100°C and the current flows for 300 seconds .

Choose the correct answers from the options given.

An electric heater rated 220 V, 1000W is immersed into a buket full of water . Calculate the mass of water if the temperature changes from 30°C to 100°C and the current flows for 300 seconds .

A: 4.28 kg

B: 42.86 kg

C: 1.02 kg

D: 7.14 kg

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Correct Answer

Explanation

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