Study Guides - Cherokee County Schools

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Name Date Class 2 28 Electricity and Magnetism Electricity and Magnetism Directions: Circle the term or phrase in parentheses that correctly completes the sentence. Chapter 8 1. When a current is passed through a coil of wire with a piece of iron inside, (an electromagnet, a commutator) is formed. 2. An electromagnet is a (permanent, temporary) magnet. 3. Adding more turns to the wire coil (increases, decreases) the strength of an electromagnet. 4. Increasing the amount of current that flows through a wire (increases, decreases) the strength of an electromagnet. 5. Electromagnets change electrical energy into (chemical, mechanical) energy. 6. An instrument that is used to detect current is (an electromagnet, a galvanometer). 7. An electric motor changes (chemical, electrical) energy into mechanical energy. 8. Like a galvanometer, an electric motor contains (a switch, an electromagnet) that is free to rotate between the poles of a permanent, fixed magnet. 9. A coil’s magnetic field can be flipped by (reversing the direction of current, increasing the number of loops) in the coil. 10. In a motor, a reversing switch that rotates with an electromagnet is called a (voltmeter, commutator). Study Guide 11. In a motor, the stronger the magnetic field in the coil, the (weaker, stronger) the force between the permanent magnet and the electromagnet. 12. The speed of an electric motor can be controlled by varying the amount of (electric current, mechanical energy) to the motor. 13. Name three devices you see or use everyday that make use of the relationship between electricity and magnetism to operate. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Name Date Class 3 Study Guide Directions: Study the following diagram. Then label the parts using the correct terms from the list. electromagnet source of mechanical energy permanent magnet 4. Is this a diagram of a generator or a motor? Directions: Circle the term in parentheses that makes each statement true. 5. When the wire loop of a (motor, generator) turns, an electric current is produced. 6. The current produced by a generator is (direct, alternating) current. 7. A motor (uses, creates) an electric current as it turns. Chapter 8 8. A device that increases or decreases voltage of electric current passing through a power line is a (transformer, motor). 9. If the secondary coil of a transformer has more turns than the primary coil, the transformer is a (step-up, step-down) transformer. Producing Electric Current Directions: In the space below, draw a sketch of a step-down transformer that has half as many coils in the secondary coil as in its primary coil. Label the two coils. 10. Producing Electric Current 29
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Study Guides - Cherokee County Schools

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