An electric heater rated as (500 W and 2...

An electric heater rated as (500 W and 200 V) raises the temperature of 1 kg water from `15^(@)C` to its boiling point in 15 min. the heat effeciency of the heater is

0.79

0.97

0.69

0.96

Text Solution

Verified by Experts

The correct Answer is:

Heat absorbed by water `=msDeltaT`
Heat supplied by heater`=vlt=Pt`
`therefore " " " Efficiency " =(msDeltaT)/(Pt)xx100`
By putting given value, efficiency `~~ 79 %`

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