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Physics, 27.11.2021 17:40 vickydaiberg

Một bếp điện có ghi 220V – 1500W được sử dụng với hiệu điện thế 220V. Dùng bếp điện này để đun sôi 2,5lít nước từ nhiệt độ ban đầu 33oC. Hiệu suất của quá trình đun là H = 90%. a) Tính nhiệt lượng thu vào của nước. Biết nhiệt dung riêng của nước là 4190J/kg. K

b) Tính nhiệt lượng bếp tỏa ra khi đun sôi lượng nước trên.

c) Sử dụng bếp điện này mỗi ngày 2 giờ. Tính điện năng mà bếp điện tiêu thụ và tiền điện phải trả cho việc sử dụng bếp điện trên trong 15 ngày, biết 1kW. h có giá 1800 đồng.

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Một bếp điện có ghi 220V – 1500W được sử dụng với hiệu điện thế 220V. Dùng bếp điện này để đun sôi 2...
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