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]

420S

336S

168S

48S

Correct answer is B

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 is put in it, how long will it take the temperature of water to rise from 20OC to 100OC? [specific heat capacity of water = 4200Jkg-1k-1]