As much or as little as you want. Watt is a unit of power, not of energy. If you use less watts, it will take longer to heat the water, but it will still work.
2,641,760J...
2,641,760J...
300
The needed energy is 10 calories.
The number of calories required will depend on the mass of water which is to be heated.
mmmm enthalpy
42 J
there are no calories in water you idiot
Kilowatts is a unit of energy rate, while the temperature required to raise a specific volume of water by a specific amount of degrees is a unit of energy, not energy rate. The question cannot, therefore, be answered as stated. Please restate the question.
1 calorie is needed to raise 1 g of water 1 °C. 350 * 22 = 7700 calories ■
212-65=147. 147(20)=2940 btu needed is this right?
Q=mcΔT Q=14 x 4200 x 21.6 Q=1270080J