Thursday 3/25/10

Today’s Agenda Warm-Up: Station Introduction Classwork: Homework: Electricity and Magnetism Stations Electro vs. Permanent Magnets Venn Diagram Electromagnet Review Worksheet (Group Challenge) Homework: Key Questions 11-15 Due Tomorrow Study for Quiz 3 Tomorrow Conclusion: Tell me what you learned today…

Student Objective Sunday, April 23, 2017 Students will be able to… Explain the important understandings related to electricity and magnetism covered during the last 3 weeks of lessons. 3

What are magnetic fields? What are magnetic poles? Magnetism What is magnetism? What are magnetic fields? What are magnetic poles? What are magnetic domains?

What can you do? Look at magnetic fields using oiled filled plastic with iron filings. See how magnetic poles interact. Experiment with magnetic levitation. See where the magnetism is strongest by picking up paper clips with various magnets.

What is static electricity? What happens when static charges interact?

What can you do? Charge the plastic surface of the box full of “pith balls” by rubbing with fur or felt and see what happens. Charge the balloon and use it to cause the aluminum can to roll across the floor in static electricity races.

What is required to create a simple circuit? Circuits What is required to create a simple circuit? What is the difference between series and parallel circuits?

Series Circuit How does the brightness of each light bulb compare to each other? What would happen if one of the light bulbs burns out?

Series Circuit How does the brightness of each light bulb compare to each other? What would happen if one of the light bulbs burns out?

Combination Circuit B A C How does the brightness of each light bulb compare to each other? What would happen if bulb A burns out? What would happen if bulbs B or C burn out? What if bulbs B and C burn out?

What can you do? Construct simple series, parallel, and combination circuits. Use 9-volt or hand crank generators to power your circuits (BE CAREFUL WITH THESE AND DON’T CRANK TOO HARD)

Electrochemical Cells What energy transformation occurs in electrochemical cells? What are the 3 parts of a cell? What are the two types of cells we made and how were they different? What is formed when 2 or more cells are connected in series?

What can you do? Build dry cell (penny cell) batteries and test the current created with the digital voltmeter. Build wet cell batteries and test the current with the digital voltmeter. See if you can create enough current to power the digital clock.

Electromagnets What is an electromagnet? What is the principle behind the creation of electromagnets? What is the difference between a permanent magnet and an electromagnet? What are the variables which can change the strength of an electromagnet?

What can you do? Experiment with the discovery of electromagnetism by seeing how the compass needle moves when you crank the hand generator to create electric current. Build electromagnets using the nails and wires provided and test their strength. Experiment with variables using the already created electromagnets… (PLEASE DO NOT TAKE THESE APART!)

Compare and Contrast Permanent Magnets and Electromagnets. vs.

Name: Date: Class: Permanent magnets Electromagnets

Permanent magnets Electromagnets Cannot turn them off. Name: Date: Period: Permanent magnets Electromagnets Cannot turn them off. Get weaker over time or if dropped. Cannot change their poles. Earth is a permanent magnet. Need no outside energy. Were discovered over 2,000 years ago. Are found in nature or man-made. Cause bio & geo magnetism Can turn them off. Can make them very strong. Can change their poles. Change electrical energy into motion in motors and sound in speakers Need electrical energy. Were invented in 1820. Are man-made. Both have magnetic lines of force in an invisible field. Both have poles (N & S) and can be used to make a compass. Both attract and repel. Both can make temporary magnets from iron, nickel, cobalt, neodymium, samarium.

Electromagnetism Group Challenge Names: ___________________ __________________________ Electromagnetism Group Challenge 1. Draw an electromagnet in the space below. 2-5: Draw a line connecting each part of an electromagnet below to the corresponding part in your diagram. Energy Source Conducting Wires Solenoid Ferromagnetic Core True or False __________ 6. Electromagnets work because electric current creates a magnetic field. __________ 7. Permanent magnets are more useful than electromagnets because they are always on and don’t require an energy source. __________ 8. An electromagnet can be strengthened by adding more loops, more current, or a stronger ferromagnetic core. __________ 9. The north and south pole of an electromagnet can be reversed. __________ 10. The magnetic field lines for an electromagnet look similar to the field lines of a single bar magnet. 75 copies (Completed in Lab Group)

Electromagnetism Group Challenge Name: ___________________ Class: ____________________ Electromagnetism Group Challenge 1. Draw an electromagnet in the space below. 2-5: Draw a line connecting each part of an electromagnet below to the corresponding part in your diagram. Energy Source Conducting Wires Solenoid Ferromagnetic Core True or False __________ 6. Electromagnets work because electric current creates a magnetic field. __________ 7. Permanent magnets are more useful than electromagnets because they are always on and don’t require an energy source. __________ 8. An electromagnet can be strengthened by adding more loops, more current, or a stronger ferromagnetic core. __________ 9. The north and south pole of an electromagnet can be reversed. __________ 10. The magnetic field lines for an electromagnet look similar to the field lines of a single bar magnet. True False True True True

Quiz 3 – Electricity & Magnetism HOMEWORK DUE FRIDAY Project Step 4 Key Questions 11-15 Quiz 3 – Electricity & Magnetism Always copy daily homework into your agenda.