Time taken by a 836; W heater to heat 1; litr | vedclass

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Question

$W = JH$ $ \Rightarrow $ $P 	imes t = J 	imes m\,s\,\Delta 	heta $

$ \Rightarrow $ $t = \frac{{J 	imes m 	imes s\Delta 	heta }}{P}$ (For wate

Vedclass · Accepted Answer

$150$

Vedclass · Answer

$W = JH$ $ \Rightarrow $ $P 	imes t = J 	imes m\,s\,\Delta 	heta $

$ \Rightarrow $ $t = \frac{{J 	imes m 	imes s\Delta 	heta }}{P}$ (For water $1\, litre$ = $1\,kg$)

$ \Rightarrow $ $t = \frac{{4.2 	imes 1 	imes 1000 	imes (40 - 10)}}{{836}} = 150\,sec$

Short Trick : use formula $t = \frac{{4200 	imes m 	imes \Delta 	heta }}{P}$

Time taken by a $836\; W$ heater to heat $1\; litre$ of water from $10^{\circ} C$ to $40^{\circ} C$ is

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