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Bellwork

Bellwork. What surrounds a wire that has current flowing through it? A magnetic field. Due Dates. Tomorrow: Rough draft of the Science Fiction Story due Wed. (4/2): Magnetic Fields H.W. due Tues. (4/8): Final draft of the Science Fiction Story due. Electromagnetic Lab. 3/31/14

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Bellwork

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  1. Bellwork • What surrounds a wire that has current flowing through it? • A magnetic field

  2. Due Dates • Tomorrow: Rough draft of the Science Fiction Story due • Wed. (4/2): Magnetic Fields H.W. due • Tues. (4/8): Final draft of the Science Fiction Story due

  3. Electromagnetic Lab 3/31/14 [Name and Period]

  4. Purpose: • To measure how much voltage and current can be produced in the lab

  5. Hypothesis: (write the out question and answer it) • How many wand magnets do you think it would take to light a 1.5 V light bulb if you move it within a coil of wire?

  6. Materials: • Solenoid • Multimeter • 2 Wand Magnets

  7. Procedures: DC Voltage • Setup the multimeter so that the two probes are in contact with the terminals on the solenoid. • The multimeter should be turned to the DC voltage 200mV position, make sure that the red probe is plugged into the voltage jack. (The jack on the right side of the multimeter.) • Conduct three trials for each of the orientations of the magnet(s), record your results in the table in mV (millivolts). The voltage will fluctuate, record the highest voltage observed.

  8. Procedures: DC Current • Now disconnect the red probe from the multimeter and plug it into the “μA/mA” jack. (The jack just to the left of the black probe on the multimeter.) • Set the multimeter to the 200μA DC position. • Conduct three trials for each of the orientations of the magnet(s), record your results in the table in μA (microamps). The current will fluctuate, record the highest current observed.

  9. Data: DC Voltage and Current DC Voltage DC Current

  10. Settings Voltage Current

  11. Solenoid Terminals Terminals

  12. Data for the Lab • Make sure the probe connections are secure to the terminals. • Record all sig. figs. • If multimeter reads negative it is just the direction of the current. • Please turn off the multimeters when done to save the batteries.

  13. Bellwork (4/1/14) • Draw the magnetic field for the following: (I) (I) (I) (I) *** Turn in the rough draft ***

  14. Bellwork (4/1/14) • Where would the magnetic field be for these? (I) (I)

  15. Bellwork (4/1/14) • Where would the magnetic field be for these? (I) (I)

  16. Bellwork (4/1/14) • Where would the magnetic field be for these? (I)● (I)X

  17. Bellwork (4/1/14) • Where would the magnetic field be for these? (I)● (I)X

  18. Electromagnetic Lab(Day 2) 4/1/14

  19. Week’s Agenda • Today – Finish “Electromagnetic Lab” • Wed. – Start “Electromagnetic Computer Lab” • Thurs – Finish collecting data for the computer lab and work on the final draft • Fri – Finish Electromagnetic Computer Lab

  20. Problems: (Use dominoes) EX. Powering a 3.9 V (3900 mV) cell phone by a method that produces 1.1 mV with two magnets. • If it takes 1.5 V (1500 mV) to light a flashlight bulb about how many wand magnets would you need to light a bulb with the best methods that you used? • If it takes 1.5 V (1500 mV) to light a flashlight bulb about how many wand magnets would you need to light a bulb with the worst methods that you used?

  21. Draw the Magnetic Fields for the Solenoid for the 3 Views Cross Sectional View:Side View: ● ● ● ● ● ● ● ● (I) (I) X X X X X X X X (I) Top View: (I)

  22. Questions: (ANSWER ALL QUESTIONS IN COMPLETE SENTENCES) You may have to use the textbook (CH 37) for some of them • What is the difference between voltage and current? • From the averages on your table, which one had the highest voltage and current? Were they the same? • From the averages on your table, which one had the lowest voltage and current? Were they the same? • How did your hypothesis compare to the problems you solved? • Where is the magnetic field located if current is flowing in the solenoid’s copper wires? • What is electromagnetic induction? • How can voltage be induced in a wire? • Why do you think that the multimeter fluctuates for each of the methods? • What is a generator? • Explain in your own word how this activity relates to generators?

  23. Draw the Magnetic Fields for the Solenoid for the 3 Views Cross Sectional View:Side View: ● ● ● ● ● ● ● ● (I) (I) X X X X X X X X (I) Top View: (I)

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