V. State questions to the underlined words:
1. Voltage may be changed by a transformer. (transformer)
2. Transformers change voltage through electromagnetic induction. (Transformers )
3. Transformer is used for increasing or decreasing voltage. (increasing or decreasing voltage)
4. The primary winding is connected to the source of power. (primary winding )
5. Transformers are placed inside a steel tank. (steel tank)
B: Yes, it is. If it b) was frozen, we could have gone skating.
2 A: Haven't you got enough money for a holiday?
B: Oh yes. I've got some saved up b) in case I suddenly need it.
3 A: What are you going to do next year?
B: I wish I a) knew the answer to that question.
4 A: These figures are too complicated to work out in your head.
B: Yes, if b) only we had a calculator.
5 A: What are you doing later this afternoon?
B: Oh, b) in case the game finishes, I'll go home, I expect.
6 A: Do you think I should take the job?
B: You shouldn't do anything c) unless you think it's the right thing to do.