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Magnetism

8th Grde Science - Brandt

QuestionAnswer
Name the three particles that make up an atom, and their charges. Proton (+), neutron (neutral), electron (-)
What positive particle is located in the nucleus of the atom? Proton
Electricity is defined as the movement of these negatively charged particles. Electrons
Define static electricity. The buildup of electrons on a substance (usually an insulator)
What is the difference between static and current electricity? In static electricity, electrons build up; in current electricity, they flow through a conductor in a complete circuit.
The force produced by a magnetic field is called _______ Magnetism
What do we call materials that have atomic structures that cause them to be magnetic? Permanent magnets
What are the only materials that are naturally magnetic? Iron, nickel, and cobalt
Why do some materials form natural magnets? They have domains (groups of atoms) that are arranged with poles. When these poles are lined up, the material becomes magnetic.
How can you create magnetic alignment in these materials? Stroke the material in one direction with a magnet.
What happens to the domains in a magnet when you drop or heat it? The domains may lose alignment, and the magnet is weakened.
This surrounds a magnet, and is strongest close to the magnet A magnetic field.
What is a temporary magnet made by placing a piece of iron inside a current carrying coil of wire? An electromagnet
This device changes electrical energy into mechanical energy by allowing an electromagnet to spin freely between the poles of a fixed permanent magnet Electric motor
This device produces electric current when a coil of wire rotates within a magnetic field generator
What are the two types of current, and what produces/provides them? AC - Alternating Current - Generator; DC - Direct Current - battery
What is the difference between the two types of current? DC flows in only one direction, and AC alternates back and forth.
How do electricity and magnetism work together in electromagnetism? Moving charges create a magnetic field, and magnetic fields make current flow.
When an object is magnetic, where do all the domains in it point? In the same direction
How is magnetism like electricity? In both electricity and magnetism, opposites attract, and like repels.
What is the main difference between magnetism and electricity? In electricity, you are dealing with charges, in magnetism, you are dealing with poles.
A device that increases or decreases the voltage of an alternating current Transformer
What are the three parts of an electromagnet? A wire coil which generates a magnetic field, a metal (usually iron) core, and a voltage source.
Created by: judi829
 

 



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