nhat68722

2 năm trước

bài 1: Có 2 bóng đèn có ghi : Đ1 (12V-6W) và Đ2 (12V-12W) được mắc nối tiếp trong 1 đoạn mạch a) Tính điện trở mỗi bóng đèn,và điện trở tương đương đoạn mạch? b) Đặt vào 2 đầu đoạn mạch 1 hiệu điện thế là 24V. Hãy nhận xét độ sáng bóng đèn khi đó?

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Viet Bui Quoc

2 năm trước

I1 = 6/12 = 0,5 A

R1 = 12/0,5 = 24 ôm

I2=12/12=1 A

R2=12/1=12 ôm

R tđ = R1 + R2 = 24+12= 36 ôm

Đm song song có U = U1 = U2

--> Hiệu điện thế đi qua 2 bóng đèn là 24 vôn

--> Bóng đèn sang hơn mức bình thường

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