Electomagnets
What is an electromagnet?
What is: Electromagnets are temporary magnets created by an electric current.
What do electric generators create?
What is: Electric generators create electricity
What is electrical energy(electricity)?
What is: This is energy contained within an electric field
What is electromagnetism?
What is: Electromagnetism is the relationship between electricity and magnetism
What is a magnet?
What is: Magnets are objects that exert an invisible force called the magnetic force
What is the term for a break in an electrical circuit?
What is: The term is an open circuit.
How do electric generators work?
What is: Electric generators use motion to create electricity.
What is a conductor, and what is an insulator?
What is: A conductor is a material that allows electricity to flow freely through it. An insulator is a material that doesn't allow electricity to flow easily.
What does the electric current produce?
What is: The electric current produces a magnetic field
What are most magnets made of?
What is: Most magnets are made of iron, nickel, or cobalt
What are two things you can do to make an electromagnet stronger?
What is: You can increase the voltage and increase the number of times the wire is coiled
What do we use electric generators for in everyday life?
What is: We use electric generators to get electricity for our daily essentials
What is the difference between static electricity and current electricity?
What is: Static electricity is electricity that builds up on an object, whereas current electricity is electricity that moves from place to place.
What are four things a magnetic field produced by a current has?
What is: 1) has strength and direction 2) can be turned off and on 3) can have direction reversed 4) can have strength changed
Do opposite poles attract or repel each other?
What is: Opposite poles attract because the same poles will repel
What do you need to build an electromagnet?
What is: You need a wire, a battery, or other power source, and an iron core
What fuel is usually burned in power plants to make steam?
What is: The fuel is Fossil Fuels
What are four good conductors and four good insulators?
What is: Conductors: copper, silver, aluminum, iron
Insulators: plastic, rubber, air, glass
What is the difference between a permanent magnet and an electromagnet?
What is: A permanent magnet makes a magnetic field all the time, while an electromagnet only makes a magnetic field when the electric current is turned on.
What does the strength of a magnet's magnetic force depend on?
What is: 1) The size of the magnet 2) What the magnet is made of 3) distance from the magnet
What are some uses for electromagnets?
What is: Some uses are hard drive disks, scrap metal sorting, and MRI machines
What happens when a loop of wire rotates through a magnet?
What is: This creates a current, and thus electricity, in the wire
How does static electricity build up?
What is: Static electricity builds up when electrons travel from one object to another. The object that gains electrons becomes negative; however, the object that loses electrons becomes positive.
How does reversing the direction of the current in a wire affect the magnetic field?
What is: This will reverse the direction of the magnetic field. The North and South poles switch places
What are the strongest magnets made from?
What is: The strongest magnets are made of Neodymium, a rare-earth metal