Alternating current generator

1,038 views

Published on

Alternating current generator

Published in: Education, Business, Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,038
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
Downloads
32
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Alternating current generator

  1. 1. Alternating current generator By S, J and S
  2. 2. What is it? • A simple AC generator consist of: – A rectangular coil. – A magnetic field. • The coil spins in the magnetic field.
  3. 3. Induced EMF • When the coil is perpendicular to the B- field induced EMF is at a maximum. • When the coil is parallel to B-field induced EMF is 0 • Because ε=BANωcosωt
  4. 4. Power Station Alternators! • In a power station 3 sets of coils are used at 120° from each other. • Each produce an alternating emf 120° out of phase from one another. • The coils don’t spin the electromagnet (in the middle) does.
  5. 5. Back EMF • An EMF is induced in the spinning coil of an electric motor because the flux linkage through the coil changes. • The induced EMF is referred to as a back EMF because it’s opposed to the p.d. • Electric power supplied by the source (IV) = electrical power transferred to the mechanical power (Iε) + electrical power wasted due to circuit resistance (I²R).
  6. 6. Fin
  7. 7. Fin

×