An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water...

JAMB 1995

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1]

A. 420S
B. 336S
C. 168S
D. 48S

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Correct Answer: Option B

Explanation

Heat energy = Elect. energy

mc\(\theta\) = power x time

2 x 4200 x (100 - 20) = 2000 x t

t = 336s

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An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water...

Correct Answer: Option B

Explanation

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