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Name ______________________________ Class ___________________ Date __________________ GOLDSBERRY Chapter 18 Section 3 Reading Section: Electricity from Magnetism ELECTRIC CURRENT FROM A CHANGING MAGNETIC FIELD 1. What problem did both Joseph Henry and Michael Faraday work to solve? _______________________________________________________________ _______________________________________________________________ 2. The process of creating a current in a circuit by changing a magnetic field is called ______________________. 3. Describe what happened to the electric current in Michael Faraday’s experiment when the battery was fully connected. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 4. Describe two ways to induce a larger electric current when you move a magnet in a coil of wires. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 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 8 Electromagnetism Name ______________________________ Class ___________________ Date __________________ Directed Reading A continued ELECTRIC GENERATORS _____ 5. What device converts mechanical energy into electrical energy? a. electric motor c. electromagnetic motor b. electric generator d. magnetic motor _____ 6. When electric current changes direction it is called a(n) a. generated current. c. alternating current. b. electromagnetic current. d. rotating current. 7. Name the four parts of a simple generator, and describe what they do. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 8. Other than the size, what is one difference between power plants and electric generators? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 9. Name two sources of energy that generators convert into electrical energy. _______________________________________________________________ _______________________________________________________________ Put the following steps for generating electrical energy in order from 1 to 4. Write the appropriate numbers in the space provided. _____ 10. Steam turns a turbine. _____ 11. Energy boils water into steam. _____ 12. Electric current is induced and electrical energy is generated. _____ 13. A turbine turns the magnet of a generator. 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 9 Electromagnetism Name ______________________________ Class ___________________ Date __________________ Directed Reading A continued TRANSFORMERS _____ 14. A device that increases or decreases the voltage of alternating current is called a(n) a. voltmeter. c. transformer. b. generator. d. electromagnet. 15. Explain why a transformer uses different numbers of loops in its primary and secondary coils. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 16. Describe what a step-up transformer does. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 17. Describe what a step-down transformer does. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 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 10 Electromagnetism