Download Faraday`s Electromagnetic Lab

Faraday’s Electromagnetic Lab
On the phet.colorado.edu website, use the ‘Faraday’s Electromagnetic Lab” simulation.
Bar Magnet Tab: properties of magnetic fields
1. You should see a bar magnet and compass. Red is magnetic North and white refers to
magnetic South. Place the compass at the North end of the magnet and observe which
way the ‘red tip’ of compass points. Move the compass to the South end and observe
where the ‘red tip’ points. Adjust your notes/diagram from class according to your
observations.
2. What does the red tip of the compass point toward?
3. The Big Idea: Use your answer to #2 to explain why the earth’s “North Pole” is actually
the magnetic south pole.
Electromagnet Tab: Factors that affect magnetic fields around current carrying wire
4. Keep the setting on DC. How is the magnetic field you see similar to Faraday’s
experiment ? How is it different?
5. Draw a picture of the loop of wire, the direction of the flow of electrons and the
direction of the magnetic field.
6. What happens to the field when you:
a. decrease and increase the battery voltage?
b. Reverse the voltage?
c. Decrease and increase the number of loops?
7. Change the setting to AC.
a. What was the battery replaced with?
b. What happens to the current?
c. What happens to the field?
8. Observe the motion of the electrons in AC and compare it to the motion in DC. Explain
the difference between AC and DC in terms of electron motion.
9. The Big Idea: Flow of electrons or ________ in a wire creates a __________ field
around the wire.
10. Based on your answers, what are the factors that affect the strength of a magnetic field
around a current carrying wire?
Pickup coil Tab: combining the magnet and a closed circuit containing a lightbulb
11. Set the number of loops to 1. What happens to the lightbulb when
a. The magnet is not moving and is not in the loop?
b. The magnet is moving but is not in the loop?
c. The magnet is not moving but is in the loop?
d. The magnet is moving and is in the loop?
12. How does the speed of the magnet affect your results in 10 b and 10 d?
13. What type of current is created in the loop: DC or AC?
a. How do you know which kind it is?
14. The Big Idea:
a. A ____________ magnet can be used to _________ a/an _______current in a
closed circuit.
b. Even better: a ___________ magnetic field can be used to _______ a/an _____
current in a closed circuit.
Transformer Tab: Putting it Together
15. Keep the setting on DC. In order to create a current in the closed loop on the right,
what must you do with the loop on the left?
16. Do that (answer to #15).
a. How do the electrons move in the loop on the right?
b. Describe how the bulb reacts.
c. What type of current in being created in the loop on the right? DC or AC?
i. How do you know?
17. What happens if you move the loop on the right?
a. Answer a-c again.
18. Change the setting to AC.
a. Do you have to do anything for a current to flow in the loop on the right?
i. Describe the magnetic field around the loop on the left.
ii. What is causing the current in the loop on the right?
19. The Big Idea: The ______ magnetic field around a circuit carrying ____ current can be
used to create an ____ current in a separate loop.
Generator Tab: Describe the transformation of energy from the beginning to the end!