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2015-10-25T20:18:05+05:30

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100 W = Power  = V² / R
Voltage V = 230 V

When two heaters are connected in series, the voltage across each of them becomes V/2.  Its resistance remains same.

So the power dissipated by each heater becomes 1/4 of 100 W ie.,  25 W.
So the total heat power of two heaters = 50 W

 heat supplied = power * time = mass of water * specific heat * ΔT
 =>   ΔT  is proportional to power * time duration
 
     T °C / 5° C =  ( 50 W * 20 sec ) / (100 W * 10 sec)

     T = 5 °C
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