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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Chapter 18 Section 2 Section: Magnetism from Electricity _____ 1. What kind of train uses an electromagnet to float above the track? a. magnetic c. electric b. maglev d. electronic THE DISCOVERY OF ELECTROMAGNETISM _____ 2. The interaction between electricity and magnetism is called a. electromagnetism. c. electric. d. electronic. b. maglev _____ 3. Oersted discovered that electric current produces a(n) a. electromagnetism c. electric. b. maglev. d. electronic. _____ 4. The direction of a magnetic field produced by an electric current depends on the direction of the a. current. c. wire. b. magnetism. d. batteries 5. Who were the two scientists who did the first research into the interaction between electricity and magnetism? _______________________________________________________________ _______________________________________________________________ USING ELECTROMAGNETISM _____ 6. What are two devices that strengthen the magnetic field of a currentcarrying wire? a. magnetic field and magnetic force b. solenoid and electromagnet c. electromagnet and current d. solenoid and current _____ 7. A coil of wire that produces a magnetic field when carrying an electric current is called a(n) a. electromagnet. c. solenoid. b. maglev. d. magnetic field Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 5 Electromagnetism Name ______________________________ Class ___________________ Date __________________ Directed Reading A continued _____ 8. What happens to the magnetic field if more loops per meter are added to a solenoid? a. The magnetic field becomes weaker. b. The magnetic field becomes stronger. c. The magnetic field turns on and off. d. There is no change in the magnetic field. _____ 9. A solenoid wrapped around a soft iron core is called a(n) a. electromagnet. c. magnetic core. b. maglev. d. magnetic field. _____ 10. What happens to an electromagnet if the electric current in the solenoid wire is increased? a. The electromagnet becomes weaker. b. The electromagnet becomes stronger. c. The electromagnet turns on and off. d. There is no change in the electromagnet. APPLICATIONS OF ELECTROMAGNETISM _____ 11. What is one thing that uses an electromagnet? a. bicycle c. computer b. doorbell d. solenoid _____ 12. An electric motor changes electrical energy into what kind of energy? a. electromagnetic c. mechanical b. electronic d. magnetic 13. Explain what happens to an electromagnet when there is no current in the wire. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 6 Electromagnetism Name ______________________________ Class ___________________ Date __________________ Directed Reading A continued Match the correct description with the correct term. Write the letter in the space provided. Some terms will not be used. _____ 14. a device that converts electrical energy into mechanical energy _____ 15. attached to the armature; reverses direction of electric current _____ 16. a loop or coil of wire that can rotate a. galvanometer b. armature c. electric motor d. commutator e. voltmeter _____ 17. used to measure current Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 7 Electromagnetism