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1.	For what purpose are the transformers used? Can they be used with a direct current source?
Answer» The purpose of the transformer is to step up or step down the a.c. voltage. No, a transformer cannot be used with a direct current source.

For what purpose are the transformers used? Can they be used with a direct current source?

Answer»

The purpose of the transformer is to step up or step down the a.c. voltage.

No, a transformer cannot be used with a direct current source.

Discussion

2.	State two advantages of an electromagnet over a permanent magnet.
Answer» 1. An electromagnet can produce a strong magnetic field. 2. The strength of the magnetic field of an electromagnet can easily be changed by changing the current in its solenoid.

State two advantages of an electromagnet over a permanent magnet.

Answer»

1. An electromagnet can produce a strong magnetic field.

2. The strength of the magnetic field of an electromagnet can easily be changed by changing the current in its solenoid.

Discussion