Electromagnetism Flashcards
Describe the relationship between magnetism and electricity. How can and electromagnet be created?
An electromagnet is a bar of iron wrapped with a coil of wire carrying an electric current.
True or False:
Magnetite also became known as Lodestone.
True
True or False:
An electromagnet is made of a bar of metal wrapped with a coil of wire carrying an electric current.
False
What are some uses of electromagnets?
Some uses of electromagnets are in telegraphs, doorbells, washing machines, motors, and telephones.
How can the strength of an electromagnet increased?
More loops of wire or faster rotation of the wire can increase the strength of an electromagnet.
What is the first principle of electromagnetic induction?
- An electromagnetic current is produced when a magnet is moved through coil of wire in a closed circuit or when a wire is moved through a magnetic field.
True or False:
Lodestones acted as the first magnets.
False
Lodestones acted as the first comopasses.
What is the second principle of electromagnetic induction?
- The faster the magnet or wire is moved, the greater the electric current.
What is the third principle of electromagnetic induction?
- More electric current is produced if more loops of wire are added to the coil.
What did the properties of magnets produce?
The properties of magnets produce the spin in electric motors for powering transportation and in generators for creating electricity.
Explain how a generator works.
A generator is a machine that converts mechanical energy into electrical energy.
Electromagnet meaning:
A bar of iron wrapped with a coil of wire carrying an electric current.
Electromagnetic Induction meaning:
The process by which electric current is produced by a changing magnetic field.
What is magnet and what causes magnetism?
A magnet is a substance that exhibits a property called magnetism
What are the magnets certain properties?
They have 2 magnetic poles, exert magnetic forces that are either attractive or repulsive and are surrounded by a magnetic field
Electromagnetism meaning:
The relationship between electricity and magnetism.
Generator meaning:
A machine that converts mechanical energy into electrical energy.
What are the magnets certain properties?
They have 2 magnetic poles, exert magnetic forces that are either attractive or repulsive and are surrounded by a magnetic field
True or False?
The ability of a magnet to deconstruct magnetic materials is strongest at the ends of the magnet, the magnetic poles, but the magnetic force extends along the whole length of the magnet.
False
True or False?
The region around a magnet in which magnetic forces can act is called the magnetic field.
True
What is it called when one point of the magnet points North?
It’s called the “North Pole”.
Why does the North Pole of a magnet and the south magnet attract each other when they approach each other?
This is because of the rule “opposites attract”
What gives a magnet 2 poles and a magnetic field?
The atoms of a magnetic materials act like tiny, individual magnets. These tiny magnetic, or atoms attract other atoms to line up so their North piles face the same direction.
What is a magnetic domain?
Within a magnet a region where the magnetic field of individual atoms are lined up. This is called a magnetic domain.
True or False:
When the atoms in the material line up, the combined magnetic field makes the material a magnet.
In most materials, the magnetic domain
What did Hans Christian Oersted get surprised about?
He noticed that whenever he brought his compass close to a live electrical wire, the needle of the compass jumped. The needle moved 90° when the electric current was turned on.
