Ideal conditions are 2 hours and 20 minutes
Preset conditions: the initial water temperature is set to room temperature of 25°C and the point boiling point is set at 100°C (one atmosphere).
The specific heat capacity of water is 4.2 kilojoules per kilogram degrees Celsius, which means the heat required to heat 80 liters, or 80 kg, of water from 25 degrees to 100 degrees is E= (100-25)*4.2* 80=2.52E7 (unit J), 2.52 times 10 to the power of 7 Joules.
In a 3 KW water heater, 3 kW refers to the power rating. If this water boiler can convert electrical energy into thermal energy with 100% efficiency and can transfer 100% heat to water through an ideal container. , the water will be heated during the heating process. If there is no heat exchange with the environment, then: t=2.52E
7 / 3E3 = 8400 (second unit) = 2 hours and 20 minutes< /p>
In real situations, energy loss must occur, so it will only take more time