Chapter 6 [Grade 12 Book ] - Electrodynamics

Question 1

What is a generator?

Answer 1

A device that converts mechanical energy to electrical energy.

Question 2

Name the parts that an AC generator is made of.

Answer 2

• Permanent magnet
  ( created magnetic field )
• Coil
  ( rotates & changes magnetic flux )
• Slip rings
  ( connects coil to external circuit )
• Carbon brushes
  ( connects slip rings to circuit )
• Isolated Axis

Question 3

Name an advantages and disadvantage of AC generator.

Answer 3

Advantage:
- Easier & cheaper to generate
- Voltage can change by using transformers

Disadvantage:
- much greater current needed.

Question 4

How is the magnitude of induces emf increased in a generator?

Answer 4

1. Move conductor faster
2. Stronger magnets
3. Longer conductor