Man's physical universe

xanabras

520 MAGNETISM AND ELECTRICITY

STUDY QUESTIONS

1. How would you proceed to transform a current of low voltage to one of high

voltage by the use of an induction coil?

2. Why do not alternating-current transformers have a make-and-break device?

3. How would you make a transformer (a) step up voltage, (b) step down a

voltage?

4. Discuss Faraday's contribution to electromagnetism.

5. What is the purpose of the oil in a transformer?

6. How may a voltage be induced in a conductor?

7. W'hat determines the strength of the voltage produced by moving a coil of

wire through a magnetic field?

8. What is a transformer?

9. How do transformers differ from induction coils?

10. How is the high voltage necessary to produce sparks in an automobile

obtained?

11. How could one change a 10-volt current to a 100,000-volt current?

12. Why is electrical energy transmitted over long distances at high voltage?

13. Give five examples of the use of transformers.

14. Count the transformers that you can see on your way to school.

15. State the three laws of electromagnetic induction.

16. Why is an alternating current used in transmission lines?

17. When a transformer raises the voltage of a circuit, does it increase the power?

Why, or why not?

18. Explain the action of the telephone.

19. Explain the behavior of a choke coil.

20. What is the purpose of the condenser in the Tesla coil?

21. What is an alternating current?

22. If the speed of the loop of wire in the generator is increased, what is the effect

on the current?

23. Would a wire pointing east and west produce an electromotive force if

allowed to fall to the ground? Why, or why not?

24. Name and give the purpose of the various parts in an alternating-current

generator.

25. Describe and explain the action of a magneto.

26. Of what does the simplest motor consist?

27. Upon what does the strength of the current produced by a generator depend?

28. What is meant by a 60-cycle current? Is it direct or alternating?

29. What happens when the direction of the current through a direct-current

generator is reversed?

30. List as many ways as you can think of to produce a direct current.

31. List the different methods of rectifying an alternating current.

32. Explain the action of the copper-copper oxide rectifier.

33. W'hat factors determine the electromotive force of a generator?

34. Prepare a list of home devices that are operated by electric motors.

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