Question

A heater connected to 220v supply has a resistance of 150 OHM.How long
will this coil take heat 1 Kg of water from 20 to 60°c. Assuming that all heat is taken up by water.


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Answer 1

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Answer 2

Answer:

Heat required to heat 1kg (=1000g) of water from 20°C to 60°C (rise of temperature ∆T = 60°C - 20°C = 40°C)= mass of water in grams × specific heat of water (1 calorie per gram of water per degree Centigrade rise of temperature) × rise of temperature in degree Celsius= 1000×1×40 = 40,000 calories

Heat generated per second by a heating coil of 150 ohm plugged into a 220 volt supply= V²/R Joule = (V²/R)/4.1840 Joule per calorie =(220²/4.184× 150 = 77.12 calorie

4.1840 Joule/calorie is the mechanical equivalent of heat ie it takes 4.2 Joule of work to generate 1 calorie if heat.

Time taken to generate 40,000 calorie of heat= 40,000/77.12 = 518. 7 sec= 8 minute 38.7 second.

It would take 8 m 38.7 s to heat 1kg of water from 20°C to 60°C.

Explanation:

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