Faraday’s Experiment Conventions: 1. What charge do electrons have? Electrons ar
ID: 1632481 • Letter: F
Question
Faraday’s Experiment
Conventions:
1. What charge do electrons have?
Electrons are_________.
2. What direction is direct current?
Electric current moves from the ____________electrode to the ___________ electrode. Therefore, direct current is _____________ the direction that electrons are moving (electron flow).
3. How are magnetic poles labeled?
Magnetic Poles are labeled _________ and ___________ .
4. What is the magnetic polarity of the geographic North Pole of the Earth?
The geographic north end of the Earth is the_____________ pole of a magnetic field.
A compass needle is a magnet—it’s _________ end is marked NORTH.
5. Historically the Earth’s Magnetic Field was defined as moving in the direction of Polaris, the Pole Star. Therefore, what is the convention of the direction of a magnetic field?
Magnetic field is defined as going from the ____________ end of a magnet to the_______________ end.
Magnetic Fields:
Go to: http://phet.colorado.edu/simulations/sims.php?sim=Magnet_and_Compass
6. What are the two factors that determine the strength of the magnetic field? What determines the direction of the magnetic field?
Electromagnets:
a. Go to: http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Electromagnetic_Lab
b. Click the tab for electromagnet
7. Notice that the electrons moving through the wire loops create a magnetic field. What happens to the magnetic field if the direction of current in the wire loop is reversed? What happens to the strength of the magnetic field as more electrons move (as current increases)?
8. When there is no voltage the electrons are still moving randomly. Since the number of electrons moving one direction is balanced by electrons moving the opposite direction then there is no net magnetic field. There is no magnetic field because there is no net flow of electrons. Predict what you think will happen if a magnet approaches a wire loop. Will the movement of electrons producing the same magnetic field be encouraged or discouraged? Will the movement of electrons producing the opposite magnetic field be encouraged or discouraged?
Pickup Coil:
a. Continue with Faradays Electromagnetic Lab
b. Click the tab for pickup coil
9. Slowly move the north end of the magnet towards the coil, what happens to the electrons in the wire as the field from the north pole of the magnet increases in strength?
10. Slowly move the south end of the magnet towards the coil, what happens to the electrons in the wire as the field from the south pole of the magnet increases in strength?
11. Slowly move the north end of the magnet away from the coil, what happens to the electrons in the wire as the field from the north pole of the magnet decreases in strength?
12. Slowly move the south end of the magnet away from the coil, what happens to the electrons in the wire as the field from the south pole of the magnet decreases in strength?
13. Consider your prediction from question number eight. A general rule for how a pickup coil will respond to a magnetic field might be:
Electrons in a pickup coil will move to minimize the disturbance in a changing magnetic field. They will tend to move so that the polarity of the coil is opposite the change in the field.
Explain, in your own words, what you think is happening to cause the electrons to move.
Generator:
a. Continue with Faradays Electromagnetic Lab
b. Click the tab for generator
14. How does a generator use the effect you noticed in the pickup coil to generate electrical energy? What energy transformations are taking place? Why does a generator make alternating current? What change would have to be made to make direct current? (Hint a generator that makes direct current is called and alternator…)
Transformer:
a. Continue with Faradays Electromagnetic Lab
b. Click the tab for transformer.
15. Describe how the energy from the battery reaches the light bulb.
16. What effect does changing the number of coils or the size of the coils have on the brightness of the light bulb?
17. Describe how this principle could be used to change the voltage of AC current.
18. Explain why this device is not effective when used with DC current. (hint—look at the changes of the magnetic field.
Explanation / Answer
1) electrons have negative charges
2) direction of current is from positive electrode to the negative electrode
Direction of current is opposite to the direction of electron movement
3). Magnetic poles are labelled as north pole and south poles
4) the geographic north end of earth is earth's south pole end of the magnetic field
The north end of a needle of compass is marked nort
5)magnetic field is defined aS going from south pole end to the north pole end
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