Physics, 06.01.2022 21:50 kingsavage2002

Hai bóng đèn có hiệu điện thế định mức là U1= 1,5 V và U2= 6 V. Khi hai đèn này sáng bình thường thì chúng có điện trở tương ứng là R1= 1,5 Ω và R2= 8 Ω. Cần mắc hai đèn này cùng với một biến trở vào hiệu điện thế U = 7,5 V theo sơ đồ như hình vẽ.Tính điện trở của biến trở khi đèn sáng bình thường

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Hai bóng đèn có hiệu điện thế định mức là U1= 1,5 V và U2= 6 V. Khi hai đèn này sáng bình thường thì...

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