Magnets
Electricty
Hydroelectricity
More Knowledge
100
A bar magnet is dipolar.
This means it has how many poles?
Two
100
Two pieces of silk have an electric charge after being rubbed on a piece of amber.
What will happen when the two silk pieces are brought close together?
Electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them
100
What is a plant called that uses water power to create electricity?
Hydroplant/HydroDam
100
What causes an electric current in a wire?
Electrons flow because of electrical attraction and repulsion.
200
If magnetic field lines are drawn for this bar magnet, which statement would be true?
To the south and to the north.....
200
Can two negatively charged balloons move apart without ever touching? Why or why not?
Yes, because electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
200
Where are there 3 falls of water that are used to creating electricity?
Niagara Falls
200
Why does a light go out when the wall switch is turned off?
The switch causes a break in the circuit.
300
Why are electromagnets used in metal scrap yards?
They are temporary magnets, so they can be turned on and off.
300
If two electrically charged objects repel one another, which statement must be true?
the two objects have the same electric charge
300
What components are used to convert water power into elextricity?
Generators, turbines
300
If an electromagnet is made using a battery circuit and a steel nail, how can its magnetic strength be increased?
wrap more coils of wire around the nail
400
Why is an electromagnet a temporary magnet?
An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.
400
Two pieces of silk have an electric charge after being rubbed on a piece of amber.
What will happen when the two silk pieces are brought close together?
They will repel one another
400
what does this image represent
generator
500
Which item is necessary to make an electromagnet?
wires!!!
500
What does this image represent
Motor