Download File - Lanier Bureau of Investigation

Generator PhET Lab
Name:
____________________________
http://phet.colorado.edu/en/simulation/generator
Answer on your own paper.
Procedure 1:
A. Instructions: <run> lab and click on the top left tab
labeled magnet.
B.Follow the directions to answer the following questions:
1)Click on the <see inside magnet> button. Draw what
you see below.
2)What do you think it would look like if you cut the
magnet in half? Draw your hypothesis.
3)Move the pointer onto the bar magnet and hold down
the left mouse button to move the magnet. The
needles around the magnet show the effects of the
magnetic field. Which part of the magnet is the
strongest, the poles or the center?
The poles are the strongest part of a magnet.
4)Slide the <Strength> bar all the way to the right. What
happens to the field when you increase the magnet’s
strength?
The stronger the magnet the larger the magnetic
field.
5)Move the magnet to the compass. Which part of the
needle is attracted to the magnet? Which part of the
needle is repelled?
Opposite needles and poles are attracted while the
same needles and poles are repelled.
6)Click on the <flip polarity> button. What happens to
the magnet? What do you think polarity means?
The poles change. Polarity means the alignment of
the domains which results in whether the pole is
north or south.
Now bring the magnet to the compass. Which part of
the needle is attracted to the magnet? Which part of
the needle is repelled? Opposite needles and poles
are attracted while the same needles and poles are
repelled.
C. Click on the top right tab labeled <pickup coil>. This is
more commonly called a solenoid. Follow the directions
and answer the questions.
1)Reduce the number of loops to one. The loops are
wires and the dots are electrons. What happens to
the electrons when you move the magnet close to the
loop?
The electrons move because they are attracted or
repelled by the magnet.
2)Move the magnet back and forth through the loop as
fast as possible. What happens?
The movement of the magnet moves the electrons
fast enough to create electricity.
3)Increase the number of loops to two. What happens
when you move the magnet back and forth through
the loops? How does this compare with a single loop?
The magnet does not have to move as quickly to
create the same amount of electricity. It is easier to
create electricity.
4)Increase the number of loops to three. What happens
when you move the magnet back and forth through
the loops? How does this compare with two loops?
The magnet does not have to move as quickly to
create the same amount of electricity. It is easier to
create electricity.
5)What affect do magnets have on electrons?
Magnets attract and repel electrons.
D. Click on the tab labeled <electromagnet>. An
electromagnet is simply an electrical source pushing
electrons through a wire. Follow the directions and
answer the questions.
1)Draw the electromagnetic field around the
electromagnet. How does this compare with the
magnetic field around a magnet? Where is the field
the strongest?
The magnetic field for an electric magnet is very
similar to a bar magnet. The fields are strongest at
the poles.
2)Move the magnet close to the compass. What
happens?
The opposite needle is attracted to the poles.
3)Increase the number of loops on the electromagnet.
What happens to the magnetic field?
The more loops a solenoid or electromagnet have,
the stronger the magnet. The magnetic field
increases in size with the strength of the
electromagnetic.
4)Slide the <10 v> to the left of the DC cell. What
happens to the magnetic field? Why do you think this
happened.
The magnetic field changes polarity because the
electrons are moving in the opposite direction.
5)Click on the <AC Current Source>. What happens to
the path of the electrons? How does this affect the
magnetic field?
The electrons begin to move back and forth changing
the magnetic field as it alternates.
E. Click on the tab labeled <generator>.
1)What steps do you think you will need to take to get
the light bulb to turn on?
1. Turn on the water 2. Which turns the magnet
(turbine) 3. Which makes the electrons move back
and forth creating electricity and turning on the light
bulb.
2)Turn on the water by sliding the button on the faucet
just a bit. Describe what happens to the magnet, to
the electrons, to the light AND to the compass.
The magnet begins to turn which attracts and repels
the magnet in the compass. The electrons making
them move through the wire creating electricity.
3)Click on <show field>. Draw what you see.
The domains move back and forth with the magnet
and the electrons.
4)Increase the flow of the water. How does this affect
the magnet, the electrons and the light?
The increased water makes the magnet turn faster
and the electrons move faster creating more
electricity so the light burns brighter.
5)What do you think a generator is from this
exploratory?
A generator includes a moving magnet and a
solenoid to create electricity.
6) What do you think will happen if you increase the
number of loops on the solenoid?
It will be easier to create more electricity due to the
larger amount of electrons near the magnet.
7)Increase the turbine. What do you think the turbine is
from your observation? A turbine is a moving magnet
used to create electricity.