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ICSE Class 10 Answered

B part
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Asked by lovemaan5500 | 13 Mar, 2018, 07:18: AM
answered-by-expert Expert Answer
Energy required to melt 0.1kg of ice at 0ºC = 0.1×336×103 Joules...............(1)
Let P be the electrical power required for heater with 40% efficiency.
Energy spent for heater in 30 seconds = 0.4×P×30 Joules ......................(2)
 
By equating (1) and (2), we get P = 2.8 kW
 

Answered by Thiyagarajan K | 13 Mar, 2018, 02:04: PM

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