acdc - Note-A-Rific: AC/DC By using the model of an...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Note-A-Rific: AC/DC By using the model of an electric motor backwards the electric generator was developed. A motor converts electrical energy to mechanical energy. A generator converts mechanical energy to electrical energy. There are two main ways that a generator can be built: 1. A connection goes from the ends of the loops to two separate slip rings (see diagram on bottom of page 745). A brush touches each of the slip rings, so that as they spin they are in constant contact. (notice these are not split rings like in the motor we studied!) Just like the situation for a motor, every half turn the direction of the current will reverse in this design. Because the current changes from being at a maximum in one direction, to a maximum in the opposite direction over and over again, it’s called an alternating current (AC). A graph of the current vs. time for this generator would look like this: This diagram show three complete revolutions of the armature. Note that the current goes from a maximum going in one direction to a maximum going in the opposite direction. Twice every rotation the current actually reaches zero for a spit second! If you were measuring this current with an ammeter, you’d see the needle bouncing back and forth all the time. 2. A connection is made using split ring commutators (see diagram on page 748). This type of generator has spit rings like the design of electric motors we looked at a few lessons back. When the wires turn so that they are totally vertical, there will be no connection with either split ring… no current. When the wires of the armature are exactly perpendicular to the magnetic field (as shown in the diagram) the current leaving the wires is at a maximum.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
o The wires are moving the fastest perpendicular to the field.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

Page1 / 5

acdc - Note-A-Rific: AC/DC By using the model of an...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online