Thermal 6

How long does it take to boil a kettle dry?

A student boiled 1 ltr of water in a kettle while measuring the temperature with a temperature sensor.  Using the information from the temperature vs time graph, estimate how long would it take for the kettle to boil dry.

Specific heat capacity of water = 4200 Jkg-1K-1

Specific Latent heat of vapourisation of water = 2.2 x 106 Jkg-1