Physics Java on the
Web
|
Electricity |
|
Magnetism |
BEFORE
YOU BEGIN: Highlight the questions you were assigned,
choose FILE, PRINT,
SELECTION, PRINT |
Electrostatics
Field
Lines
Charges
and Fields - Part I
In which general direction do all the electric field lines
point near the positive charge?
________________________________________________________________________
near the negative charge? ____________________
Where is the electric field strongest?
________________________________________________________________________
What is the geometric shape of the field
between the charges? Click many times in this area until the pattern is clear.
________________________________________________________________________
Charges
and Fields Part II
Move the small yellow charges around each
charge. What do you think it means when the arrows get bigger as you move the
small charges near the bigger charge?
________________________________________________________________________
Is the yellow charge positive of negative? __________
Explain your answer.
________________________________________________________________________
Current Electricity
BEFORE
YOU BEGIN: Highlight the questions you were assigned,
choose
FILE, PRINT, SELECTION, PRINT |
Electric
Circuit Activity IMPORTANT - Scroll down to the
SECOND circuit on this page where it says "Procedure for Series Circuit"
Series Circuit
Series circuits and voltage
DIRECTIONS: 1) Close the circuit with your mouse (purple switch) 2)
Press SHOW VOLTAGES. |
1. List the resistance values of the 3 bulbs
originally in the circuit. R =
__________ R = __________ R = __________
2. What are the voltages of each
of these bulbs? V = ________ V = ________ V = ________
3. How does the sum of the light bulbs voltages compare
with the batteries voltage?
________________________________________________________________________
4. Drag and drop new light bulbs on top of
the existing light bulbs. How does the sum of the voltages of the new
light bulbs compare with the batteries voltage?
________________________________________________________________________
5. What is the relationship between the size
of the resistance of the bulbs and their brightness? (Experiment with
different bulb arrangements)
________________________________________________________________________
Series Circuits and Current
DIRECTIONS: 1) Close the circuit with your mouse (purple switch)
2) Press SHOW CURRENTS and press HIDE
VOLTAGES (make sure the circuit is closed) |
6. What do you notice about the
current going through each resistor?
________________________________________________________________________
7 Vary the bulbs in the
circuits. What conclusion can you make about the size of the total resistance
and the size of the total current in a series circuit?
________________________________________________________________________
Parallel Circuit (Scroll DOWN a little)
DIRECTIONS: Close the circuit with your mouse (purple switch)
b) Choose HIDE VOLTAGE and
SHOW CURRENT |
8. Compare the size of the current going INTO
the whole middle branch (two bulbs connected in parallel) with the SUM of the current in
EACH bulb in the middle
branch.
_________________________________________________________________________________
9. Drag and drop different size bulbs on to
the middle branch. a) Compare the brightness of the low resistance bulbs with the
brightness of the high resistance bulbs.
_________________________________________________________________________________
b) What is the relationship
between the size of the resistors in the middle branch and their current.
_________________________________________________________________________________
Ohm's Law -
University of Oregon
1. How much resistance must be placed into this
circuit to make the light bulb light with the 12 volt battery?
a) how much resistance for the 6? ________
18? ________ 24? ________
2. Determine the amperage (current) of
the light bulb.
Magnetism - Check these out
Television
Tube
Generator
Direct
Current Electrical Motor
Induced
Current