Công suất sản ra trên điện trở 10 Ω  bằng 90W. Hiệu điện thế trên hai đầu điện trở bằng

A. 90V

B. 30V

C. 18V

D. 9V

Choose the letter A, B, C or D to answer these following questions

Bob is a student. This is his bedroom. He does his homework, play computer games and relax here. There is a desk, a chair, a wardrobe, a bed and a bookshelf in his room. The wardrobe is between the desk and the bed. There is a computer, ten books and five pens on his desk. There are some pictures of his family on the wall. He loves this room so much, so he cleans it regularly.

Question: What is his name?

A. Bob

B. Bing

C. Bunny

D. Ben