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Quiz Unit P7

Magnetism and Electricity

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? They always have a N and a S pole if their domains are aligned. 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) with poles due to how their electrons are arranged. When these domains are lined up in the same direction, the material becomes magnetic.
How can you create magnetic alignment in iron objects (like in the paperclip in the create your own compass lab)? Stroke the material in one direction with a magnet and the domains line up
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.
When an object is magnetic, where do all the domains in it point? In the same direction
How is magnetism like static electricity? In both static electricity and magnetism, opposites attract, and like repels.
What is the main difference between magnetism and electricity? In electricity, you are dealing with charges (negative electrons moving around), in magnetism, you are dealing with poles.
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.
What is a small magnet that is free to spin that aligns with the earth's magnetic field? compass
Where on a permanent magnet is the magnetic field the strongest? at the poles
If you put a north and south pole together, what happens? They attract
If you put a north and a north pole together, what happens? They repel
How does an electromagnet work? When current flows it creates a magnetic field in the coil. The domains in the iron core line up with the magnetic field in the coil of wire.
If you put a positive charge and a negative charge together, what happens? They attract
If you put a negative charge near a negative charge what happens They repel
In the lab electrons rubbed off the wool onto the ruler so the ruler got what charge? negative
In the lab electrons rubbed off test tube onto the silk, so the test tube got what charge positive
___________ hold onto their electrons tightly. Examples are glass, rubber, paper, plastic insulators
_________ do not hold onto their electrons tightly. Electrons move freely through them. Example metals and water. conductors
lightning happens when there is a big build up of negative charge in clouds. When it jumps to the ground that is called what? static discharge
For current to flow in a conductor there must be a complete ____ circuit (continuous loop, no breaks)
What is the flow of electrons in a circuit called current
What is the SI unit for measuring current? amps (A)
The difference in potential electric energy, or electrons, between two areas that creates the push to move charges in a circuit. Voltage
What is the SI unit for measuring voltage volts (V)
Opposition to the flow of current in a circuit is called ______. It is kind of like friction, but in a wire and it makes the wire get hot. Resistance
What is the SI unit for resistance in a circuit. ohms (symbol is like an upside down horseshoe)
Created by: tbrandt