Physics, 29.11.2021 14:00 carter283

1 bếp điện khi 220V 10W Mạch sử dụng sởi hiểu điện thế 220v để đun sôi 2 lít nước có nhiệt độ ban đầu là 25 độ C hiệu suất của quá trình đun là 85% c) Nếu gập đối dây điện trở của hẹp này và vẫn sử dụng hiệu điện thể 220V thì thời gian đun sôi 21 nước có nhiệt độ ban đầu và hiệu suất như trên là bao nhiêu 2

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1 bếp điện khi 220V 10W Mạch sử dụng sởi hiểu điện thế 220v để đun sôi 2 lít nước có nhiệt độ ban đầ...

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