The power of an electric appliance is 2kW. How many kilowatts of electricity does it use after it works normally for 3 hours

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• 12. For some common household appliances rated current and power
• 13. Want to know how to calculate the power consumption of electrical appliances? 1. For example, a refrigerator: the power consumption (kWh / 24h) is 0.49. What is the daily power consumption? How to calculate it? 2. A 2.5-hp cabinet air conditioner: the energy efficiency ratio is 3.39, the input power (W) is 2130, and the cooling capacity is 7350 (W). What is the hourly power consumption of this air conditioner? What are the following figures of the energy efficiency ratio, the input power and the cooling capacity?
• 14. How many kilowatt hours does a 1000W household appliance need? Oh
• 15. What's the power rating on the household appliances? If it says the rated power is 900W, how much power does the appliance operate at 900W from the beginning to the end? An electric rice cooker, does he start cooking with 900W power? Casually ask the amount of power written on the household appliance, does it mean that the maximum power consumption of this appliance is 900W? Not more than that?
• 16. Electrical appliances in school dormitories should not exceed a few watts It refers to some regulations of the state that the dormitory of a school should not exceed how many watts. If it exceeds a certain power, it is considered as a high-power electrical appliance
• 17. Xiaodong's refrigerator's name plate is shown in the following table. When Xiaodong's household appliances only have refrigerator working, it takes 6min to observe the refrigerator from start to stop working, and the turntable of the electric energy meter turns 18 times. Then the refrigerator actually works in one day when it works with rated power consumption______ h. Start up______ Each time, every 1 kilowatt hour consumed, the meter turns______ Power consumption 0.72kw · H / 24h rated voltage 220V refrigerating capacity 4kg input power 120W refrigerant R600a climate type n · st
• 18. There is a refrigerator, its main technical parameters table has a column called power consumption (kW. H / 24h), the data is 0.66, you know
• 19. Why is there a big gap between the actual power consumption of refrigerator and that provided on the nameplate? Because the refrigerator has the working characteristics of I asked about the characteristics of the job
• 20. Xiaoming's family bought a new induction cooker. Its rated voltage is 220 V and rated power is 1000 W. let the induction cooker work under the rated voltage. Heat 10 kg water from 2 ℃ to 100 ℃ without heat loss. It is known that C water = 4.2x10 cubic J / (kg. ℃). Question: (1) how much heat does water need to absorb? (2) what is the heating time?