If an electric kettle marked 500 W, 220 V takes 15 min to boil 1 kg of water from 10ºC then the efficiency of kettle is -
Text Solution
Verified by ExpertsThe correct answer is:
B
P × t = mS Δ T
P = 
= 
= 420 watt (power given by kettle)
∴ n% = 
× 100 = 
× 100 = 84%
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