Answer to Question #232438 in Mechanical Engineering for Ali

Question

An electric kettle with a 2kW heating element has a heat capacity of 400JK1. lkg of water at 20°C is placed in the kettle. The kettle is switched on and it has been found that 13 minutes later, the mass of the water in it is 0.5kg. Ignoring the heat losses calculate the value of the specific latent heat of vaporisation of the water, Specific heat capacity of water:4200J

Answer 1

$H=Pt=msΔ\theta$

$2000t=(1+0.5)(4200)(100-20)$

$t=252 sec=4.2min.$