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leekelvin525
2 năm trước
Một ấm điện có ghi 220V-1000W được sử dụng với hiệu điện thế 220V để đun sôi 2 lít nước từ nhiệt độ ban đầu 25 o C. Hiệu suất của ấm là 90%, trong đó nhiết lượng cung cấp để đun sôi nước được coi là có ích. Biết nhiệt dung riêng của nước là 4200J/kg.K. a. Tính nhiệt lượng cần để đun sôi 2 lít nước trên. b. Tính nhiệt lượng ấm điện đã tỏa ra khi đó. c. Tính thời gian đun sôi lượng nước trên.
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