Assume a cup contains about 12 oz or 340 g of water at roomtemperature, about 20 degree C. The electric kettle draws energyfrom the wall outlet at a rate (Power) of 990W. Draw a singleEnergy-Interaction Diagram for the process of bringing the water toa rolling boil. Choose an appropriate physical system, as well asan initial and a final point in time and indicate all initial andfinal conditions on your timeline. Explicitly state any otherassumptions you're making in words (incl. observations) and includean energy-conservation equation. Use your energy-conservationequation to calculate the amount of energy necessary to bring thewater to a rolling boil. Then use what you know about the power ofthe electric kettle to calculate how long it will take to bring thewater to a rolling boil (all water in liquid/gas mixed state).
