Question

A heating rated 100W is used to boil off 0.5kg of boiling water. the time to boil the water is ? (specific latent heat of vaporization= 2.30 × 10^6J/kg

Answer 1

$P=\frac Qt=\frac{Lm}t,$

$t=\frac{Lm}P=3.2^h.$