Aircraft Electricity 1
What force is demonstrated in objects with unlike charges?
attraction
If an object is placed in the field of a strong electromagnet connected to an AC line, the object will be __________.
demagnetized
An insulator is a material containing __________ valence electrons.
five or six, seven or eight. (more than four valence electrons)
The three substances that form natural magnets are .
iron, nickel, and cobalt
Diamagnetic
Cannot be magnetized
What type of magnet depends on flowing current to produce a magnetic field?
Electromagnet
What is the smallest part of an element that still retains the properties of that element?
An atom
Paramagnetic
Can be magnetized, but not as easily
Matter can exist in only two states: solid or liquid.
False (solids, liquids, gases, plasma)
The north pole of a compass needle points in the direction of the south geographic pole.
False (south magnetic pole)
flux (phi)
Magnetic lines of force
What part of an atom has no charge?
Neutron
What part of an atom has a positive charge?
Proton
The measure of a material's resistance is magnetism is known as __________.
Reluctance
Direct current is described as __________.
Unidirectional
The regions formed in the molecular structure of magnetic metals are sometimes called magnetic __________.
domains
Ferromagnetic
easily magnetized
What are the three principle parts of an atom?
electron, neutron, and proton
Electrical current is the flow of __________.
electrons
To locate the north pole of an electromagnet, use the __________ -hand rule.
left
In the English system, the total force producing a magnetic field is the __________.
magnetomotive force
A conductor is made from a material that contains between __________ valence electrons.
one and three (fewer than four valence electrons)
The measure of a material's ability to be magnetized is called __________.
permeability
The north magnetic pole of a compass needle is attracted to the __________ magnetic pole of the earth.
south