Electricity
Magnets
Magnetic Field
Electromagnets
Deep Thinking
100
What is electricity?
a form of energy that involves the flow of electric charges
100
What is a magnet?
an object that attracts certain metals
100
What is a magnetic field?
the area around a magnet where the force of the magnet can act
100
What is an electromagnet?
a magnet that forms when electric current flows through a wire that is wrapped around a piece of metal
100
What is the difference between static and current electricity?
static electricity: electric charges build up
current electricity: negative charges have a continuous flow
200
What are atoms?
tiny particles that have electric charges and make up all matter
200
What is magnetism?
the pushing or pulling force caused by a magnet
200
Why does a magnet not need to touch a metal object in order for the magnet to move the object?
because of the magnet's magnetic field
200
How can an electromagnet be made stronger?
by increasing the electric current flowing through the electromagnet's wire
200
What is the difference between conductors and insulators?
Conductor: materials that allow electricity to flow easily through it
Insulator: material that does not allow electricity to flow through it
300
Objects with the same kind of electric charge _____ each other.
repel
300
Where is a magnet's magnetism the strongest?
at the poles
300
How can the invisible magnetic field be observed?
by sprinkling iron filings around the magnet
300
By wrapping a wire more times around a piece of metal, an electromagnet is made (stronger/weaker).
stronger
300
How have electromagnets helped people solve real-life problems?
- maglev trains make transportation faster
- MRI machines help doctors to keep people well
- household appliances make less work for people
- lifts heavy objects for construction workers
400
Objects with the same amount of positive and negative charges are considered to be _____.
neutral
400
Magnets with _____ poles attract.
opposite
400
Which of the following items will magnets attract?
iron / wood / plastic / paper / steel / nickel
iron, steel, and nickel
400
Why is an electromagnet considered to be temporary?
because it has a switch that turns electric current on and off
400
Why is it important to learn about conductors and current electricity?
The body is a conductor. Knowing this will help keep people safe around electricity. For example, we avoid putting metal objects in wall outlets because this would complete the circuit and give us an electric shock.
500
Which electric charge can move from object to object?
a negative charge
500
How can magnets be helpful?
- pick up spilled pins or nails
- hear sound from speakers in a computer, TV, or car
- help a cow stay healthy
500
Draw a picture of a bar magnet's magnetic field.
500
DAILY DOUBLE
T or F: Quarters and copper pennies are magnetic but do not complete circuits.
FALSE: they are NOT magnetic but they CAN complete circuits
500
Draw a picture showing the difference between open and closed circuits.
