Bài tập : Cho mạch điện gồm hai điện trở R1 = 12W , R2 = 18 W mắc song song với nhau giữa hai điểm có hiệu điện thế U= 9V.
a. Tính điện trở tương đương của đoạn mạch.
b. Tính cường độ dòng điện qua mỗi điện trở và qua mạch chính
c. Tính nhiệt lượng toả ra trên mạch điện trong 10 phút.
d. Mắc nối tiếp bóng đèn 6V- 9W vào mạch điện, đèn sáng như thế nào? giải thích ?
11. There are a few tourists from Asia. (tourists from more are Asia. There more and )
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12. A lot of immigrants came from Europe. (immigrants come more from Europe. and More )
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13.Australian wine wasn't that good in the past. (better better. Australian is and wine )
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14. Surfing used to be less popular.(Surfing more and more is popular. )
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15. Coastal cities used to be less populated.(are and Coastal populated. more more cities )
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16. Many people didn't realise how dangerous it was to lie in the sun.(is how sun. more and dangerous realise the lie to it More in people )
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17. Children spend a lot of time watching TV. (spend watching and time more TV. Children more )
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18. There are not many French songs on French radio. (French and fewer radio. songs There fewer French are on )
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19. It is difficult to find a parking place. (find to difficult a is It and more parking place. more )
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20. Nowadays, personal computers are not very expensive. (expensive. computers Nowadays, and less less are personal)
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