Cho mạch gồm R1= 30 Ω nối tiếp R2=20 Ω. Hiệu điện thế giữa 2 đầu đoạn mạch là 50 V

a. Tính điện trở tương đương của đoạn mạch.

b. Tính công suất tiêu thụ của đoạn mạch

c. Tính CĐDĐ qua mạch và HĐT giữa hai đầu R2

1. Children seem to have lost their _______________ in reading. (enjoy)
2. Most of the __________ have lived here all their lives. (village)
3. She listens to classical music for _____________. (relax)
4. I find this piece of music very _________. (rest)
5. He made a ________ of Roman coins and medals. (collect)
6. Harry Potter is an _____ book for children, but my youngest sister is not at all ___________ in it. (interest)
7. The French team was _____________ not to win the match. (luck)
8. The weekend passed ___________- and we all felt very _____________. (enjoy-rest)
9. The song remembers the brave____________ who died for the country. (heroic)
10. There is a small bamboo forest at the _______________ to the village. (enter)

giải thích được không ạ?