Đề chọn HSG
Chia sẻ bởi Nguyễn Văn Hợi |
Ngày 14/10/2018 |
32
Chia sẻ tài liệu: Đề chọn HSG thuộc Vật lí 9
Nội dung tài liệu:
Cho mạch điện. Biết UAB= 18V; R1, R2 là biến trở, bóng đèn Đ loại 12V – 6W.
1. Khi R2 = 12 để công suất tiêu thụ trên R1 lớn nhất cần điều chỉnh R1 đến giá trị nào? Tính công suất lớn nhất đó ?
2. Khi R1 = 20 cần chỉnh R2 đến giá trị nào để:
a/ Công suất trên mạch CB lớn nhất ?
b/ Công suất trên R2 lớn nhất ? Tính công suất lớn nhất đó ?
3. Tính hiệu suất của mạch điện ở câu 2b? (xem công suất trên hai biến trở là hao phí)
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1. Khi R2 = 12 để công suất tiêu thụ trên R1 lớn nhất cần điều chỉnh R1 đến giá trị nào? Tính công suất lớn nhất đó ?
2. Khi R1 = 20 cần chỉnh R2 đến giá trị nào để:
a/ Công suất trên mạch CB lớn nhất ?
b/ Công suất trên R2 lớn nhất ? Tính công suất lớn nhất đó ?
3. Tính hiệu suất của mạch điện ở câu 2b? (xem công suất trên hai biến trở là hao phí)
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Người chia sẻ: Nguyễn Văn Hợi
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