an immersion rod of 2kw and 220v rating is used to heat 15 litres of water if initial temperature of water is 20 degree Celsius. what would be the temperature after heating it for 15 minutes. the specific heat capacity of water is 4200j/kg degree Celsius.
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Explanation:
1 lt = 1dm³ = 1000cm³ 15lt = 15000 cm³ so, mass of water = 15000gm = 15 kg Heat = mS(T - 20) 2000 × 15 × 60 = 15 × 4200 × (T - 20) 1200/42 = T - 20 28.57 + 20 = T so, T = 48.57° C
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