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Magnets
Electromagnetism
Electrial Energy Generation
Vocabulary
Chapter 21
100
Like magnetic poles repel one another, what do opposite magnetic poles do?
Opposite magetic poles attract one another.
100
Who discovered the connection between magnetism and electricity?
the Danish scientist, Hans Christian Oersted
100
How is voltage induced in a conductor?
by a changing magnetic field
100
What is the force a magnet exerts on a magnet or on moving charges?
Magnetic Force
100
Where is the field of a magnet strongest?
near a magnet's pole
200
What are the two poles on a magnet?
The two poles on an magnet are the North Pole and South Pole.
200
When you move electric charges, what do you create?
a magnetic field
200
What are two types of generators?
AC generators and DC generators
200
What is a region on a magnet where the force produced by the magnet is strongest?
Magnetic Pole
200
A galvanometer is a device that uses a solenoid to measure?
small amounts of current
300
A ________ _____, which is strongest near a magnet's poles, will either attract or repel another magnet that enters the field.
Magnetic Field
300
Changing the current in an electromagnet controls the ________ and _________ of its magnetic field.
Strength and Direction
300
How can a transformer change voltage and current?
by inducing a changing magnetic field in one coil
300
A _______________ _____ is a force associated with charged particles, which has two aspects, electric force and magnetic force.
electromagnetic force
300
A ferromagnetic material is?
a magnet if its domains are aligned
400
If the domains of a ferromagnetic material are aligned randomly and the magnetization of the domains is cancelled, is the material a magnet?
No
400
The strength of an electromagnet depends on the number of loops in the coil in the solenoid, the type of ferromagnetic core, and what else?
the current in the solenoid
400
What are some sources of electrical energy in the United States?
water, wind, natural gas, and petroleum
400
What is an electromagnet?
An electromagnet is a solenoid with a ferromagnetic core.
400
What's one thing you learn in Chapter 21? Explain or give details.
Opinionated
500
When a material is __________, most of its magnetic domains are aligned.
Magnetized
500
Electromagnetic devices, such as electric motors and loudspeakers, change electrical engery into what?
mechanical energy
500
What is a device that converts mechanical energy into electrical energy by rotating a coil of wire in a magnetic field?
a generator
500
The process of generating a current by moving an electrical conductor relative to a magnetic field is known as what?
Electromagnetic Induction
500
Look around this classroom and point out 3 magnets.
Where ever magnets are in the classroom.