A 100W water heater coonected across 230V heats a certain quantity of waterby 5degree celsius in 10s.If two such heaters are connected in series and immersed in the same quantity of water by what temperature would the water rise in 20s?
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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
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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