* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electromagnet Review Slides
Electrical resistance and conductance wikipedia , lookup
National Electrical Code wikipedia , lookup
Magnetic field wikipedia , lookup
Insulator (electricity) wikipedia , lookup
Hall effect wikipedia , lookup
Electricity wikipedia , lookup
Wireless power transfer wikipedia , lookup
Electromagnetism wikipedia , lookup
Lorentz force wikipedia , lookup
Magnetic monopole wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Magnetoreception wikipedia , lookup
Alternating current wikipedia , lookup
History of electrochemistry wikipedia , lookup
Magnetochemistry wikipedia , lookup
Faraday paradox wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Skin effect wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Scanning SQUID microscope wikipedia , lookup
Electric machine wikipedia , lookup
Superconductivity wikipedia , lookup
Multiferroics wikipedia , lookup
Eddy current wikipedia , lookup
Galvanometer wikipedia , lookup
Force between magnets wikipedia , lookup
Magnetic core wikipedia , lookup
History of geomagnetism wikipedia , lookup
Name: ________________ Class: ________________ Directions: Use pages 38-40 of the electricity and magnetism textbook to answer the following questions. 1. What is a solenoid? A solenoid is a current carrying coil of wires with many loops. 2. What can be placed inside a solenoid to strengthen the magnetic field? Any ferromagnetic material can be placed inside a solenoid to strengthen the magnetic field. 3. What is an electromagnet? An electromagnet is a solenoid with a ferromagnetic core. It is also a strong magnet that can be turned on and off. 4. What are the 4 ways that you can increase the strength of an electromagnet? 1. You can increase the current in the solenoid. 2. You can add more loops of wire to the solenoid. 3. You can wind the coils of the solenoid closer together. 4. You can use a stronger ferromagnetic material for the core. solenoid 5. _____________________________ (coil of wires) conducting wire 7. _____________________________ ferromagnetic core 6. _____________________________ energy source 8. _____________________________ 9. What are 3 benefits of using an electromagnet instead of a regular magnet? Can turn the power on and off Can control the strength (make stronger) Can switch the North and South poles Permanent magnets 1. Cannot turn them off. 2. Get weaker if dropped or heated. 3. Cannot change their North and South poles. 4. Earth is an example 5. Need no outside energy. 6. Were discovered over 2,000 years ago. 7. Can be found in nature or human made. Both 1. Have an invisible magnetic field 2. Have poles (North & South) 3. Can be used to make a compass. 4. Attract and repel. 5. Can make temporary magnets from iron, nickel, cobalt, neodymium, samarium. Electromagnets 1. Can turn them off. 2. Can make them stronger, 3. Can change their North and South poles. 4. Need electrical energy. 5. Were invented in 1820. 6. Are always human made. 7. A scrap yard crane is an example. Name: ______________________ Date: _______________________ Class: ______________________ Part 1 - Click on the links provided to complete the activities and answer the accompanying questions. http://www.ndt-ed.org/EducationResources/HighSchool/Magnetism/electromagnets.htm 1. Describe one use for powerful electromagnets. Part 2 - Use the following website to fill in the table and investigate how an electromagnet functions. http://archive.fossweb.com/modules3-6/MagnetismandElectricity/activities/electromagnet.html Power Supply (AC or DC) Volts (10, 50, or 100) Wire Gauge (Thick, Med, or Thin) AC Wire Type (Al, Cu, or String) # of Winds (in tens) Al Filings Remaining 463 0 DC 100 Med 50 DC 50 100 278 80 401 Cu Med 481 60 500