Electricity

In any generator, current will flow whenever there is _ between the wire coil and the magnetic field.

relative motion

What does each of the three digits represent in the left-hand rule for generators?

a. First finger magnetic field direction.

b. Middle finger direction of current (EMF).

c. Thumb motion of conductor.

The coil of wire in a generator where the current is induced is called the

armature

The device that converts the AC current produced in the armature into DC current is called the

commutator

Current is transferred from the rotating commutator to

stationary brushes

The principal parts of a small aircraft DC generator are the

field frame, armature, commutator, brushes

The field frame of a generator has two primary functions. They are to

complete the magnetic circuit, act as a mechanical support

The magnetizing force inside a generator is produced by an electromagnet called a _ and a core called the _ or _.

field coil, field pole, pole shoe

Each brush is connected to the external circuit by a flexible braided-copper

pigtail

Brushes are made of high-grade _ to prevent undue wear on the _ yet still have a reasonable service life.

carbon, commutator

Generators may be constructed in one of three ways. They may be:

series-wound, shunt-wound, compound-wound

_ are not used in aircraft because of poor voltage regulation characteristics.

Series-wound generators

Compound-wound generators may be one of three types: _ , _ , or _

over compounded, under compounded, flat compounded

The distortion of the magnetic field between the generator poles caused by the magnetic field created by the armature current is called

armature reaction

The position where the plane of two opposite coils is perpendicular to the magnetic field of the generator is called the

neutral plane

Some generators use _ to counter the effect of armature reaction

interpoles

The speed at which a generator begins to produce its rated voltage is called the _ and is usually about _

coming-in speed, 1,500 RPM

The strength of the induced current depends on the _ and the _ at which the lines of flux are cut

strength of the magnetic field, speed