Question

Water at 10°C enters into a geyser. The water drawn out from the geyser has a temperature of 60°C and the rate of outflow of water is 18 kg/hr. The rating of the geyser is :

Options

• 250 W

• 1260 W

• 1050 W

• 900 W

Answer 1

1050 W

Explanation -

Given,

Change in temperature of water, ΔT = 60° C - 10° C = 50° C

Heat supplied, θ = m S ΔT

Power `= "W"/"t" = ("JH")/"t" = ("Jm"Δ"T")/"t"`

= `(4.2 xx 18 xx 1 xx (60 - 10) xx 1000)/(60 xx 60) = 1050  "W"`