JAMB - Physics (1994 - No. 17)
Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg-1]
336W
450W
560W
600W
Forklaring
p x t = heat energy
P x 1 x 60 = 100 x 336
p = 560W
P x 1 x 60 = 100 x 336
p = 560W