Magnetism
What does a galvanometer (ammeter) measure? Bonus: What is the unit it measures?
Electric current (electricity) is measured in amperes (A)
What causes an aurora or "northern lights"?
An aurora is formed when charged particles from the sun (solar flares) hit the earth's atmosphere.
Who discovered the photoelectric effect? (Bonus points, what year did he get the nobel prize?)
Albert Einstein. He got the nobel prize in 1921. (I will also accept 1920)
True or False: An electromagnet is a permanent magnet.
False. An electromagnet can be turned on or off. It is not permanent.
If a south end of a magnet is close to a north end of a magnet, the magnets will _________.
Attract!
Electric field lines point out of positive charge and go into negative charge.
What can supply current to an electrical wire?
A battery (or a magnet!)
Name one way you can make a motor stronger.
Use larger coils, bigger battery, or stronger magnets.
True or False: A metal scrapyard machine is an example of an electromagnet.
True
How can you make a magnet levitate?
A magnet will levitate if the same poles are facing each other such as (north and north) or (south and south)
What does an electric generator do?
A generator takes mechanical energy and converts it into electric energy.
An electromagnet is turned on and produces a magnetic field. Where did the magnetic energy come from?
The battery converted electric energy to magnetic energy.
What is the difference between a rotor and a stator in a motor?
A rotor is made of coils that rotate. The stator is a permanent magnet that stays still.
What 2 ways can you increase the power of an electromagnet?
Increasing the coils or the battery size
Electric current is produced by passing ______ into coils of wire?
magnets
What do scientists think causes the Earth's magnetic field?
The movement of liquid iron (magma) rotating in the Earth's core.
A solar panel converts __________ into __________.
A solar panel converts sunlight energy into electrical energy.
True or false: an electromagnet can work without electricity.
False. It must use electricity to create a magnetic field in the coil.
Will a magnet attract copper?
No, copper is not magnetic.
What happens to a compass when a wire is connected to a battery?
A compass needle will deflect (point away) from the wire.
In order to create a motor, you need copper wire, a magnet, and a ___________ ?
Battery
What is p-type silicon? Bonus: What chemical element is it made out of?
P-type silicon is positively charged because it has less electrons. It can be made with Boron or Gallium.
An electromagnet is made up of what three items?
What is an iron nail, battery, and a wire?