An immersion heater is rated 836 watt. In what time, it should heat 1 litre of water from `20^@C` to `40^@C` ? `J = 4.18 J//cal`.
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Heat produced by heater in time `t = P xx t= 836 t` Heat taken by water ` = m s d theta = (100 xx 1) xx 1` `xx (40 - 20 )cal = 1000 xx 20 xx 4.18J` `:. 836 t = 1000 xx 20 xx 4.18 or t = 100s`
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