A electric kettle ( rated accurately at `2.5 kW`) is used to heat `3 kg` of water from `15^(@)C` to boiling point . It takes `9.5 min`. Then the amount of heat that has been lost is

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

An electric kettle takes 20 min. to heat a certain quantity of water from 0^@C to boiling point. It requires 90 minutes to turn all the water at 100^@C into steam. Find the latest heat of vaporisation. (specific heat of water= 1 cal//gm//^@C )

An electric kettle was marked 500 W,220 V and was found to raise 1 kg of water to 20^(@) to the boiling point in 20 minutes. Calculate the heat efficiency of the kettle. Sp. Heat of water = 4200 J kg^(-1) K^(-1) .

An electric heater takes 15 min to raise a certain quantity of water from 0°C to its boiling point.If it takes another 80 min to turn all water into steam ,find the latent heat of vaporsation of water.

Heat needed to raise the temperatre of 1 kg of water from 14.5^@C to 15.5^@C is_____

It takes 10 min for an electric kettle to heat a certain quantity of water from 0^@C to 100^@C . It takes 54 min to convert this water 100^@C into steam Then latent heat of steam is