Electric Current And Ohms Law Answer Key.pdf Free Download Here Section 20.2 Electric Current and Ohm’s Law http://www.matsuk12.us/cms/lib/AK01000953/Centricity
Section 20.2 Electric Current and Ohm’s Law (pages 604–607) This section discusses electric current, ... electric field 16
All rights reserved. Section 20.2 Electric Current and Ohm's Law. (pages 604– 607). This section discusses electric current, resistance, and voltage. It also uses. Ohm's Law to explain how voltage, current, and resistance are related. Reading Strateg
Section 20.2 Electric Current and Ohm’s Law (pages 604–607) This section discusses electric current, resistance, and voltage. It also uses
Section 20.2 Electric Current (pages 604–607) This section discusses electric current, resistance, and voltage. Reading
Section 20.2 Electric Current and Ohm’s Law (pages 604–607) This section discusses electric current, resistance, and voltage. It also uses
20.2 Electric Current and Ohm’s Law Reading Strategy Predicting Copy the table below and write a prediction of what electric current is. After you
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Name ___________________________ Chapter 20
Class ___________________
Date _____________
Electricity
Section 20.2 Electric Current and Ohm’s Law (pages 604–607) This section discusses electric current, resistance, and voltage. It also uses Ohm’s Law to explain how voltage, current, and resistance are related.
Reading Strategy
(page 604)
Predicting Before you read, write a prediction of what electric current is in the table below. After you read, if your prediction was incorrect or incomplete, write what electric current actually is. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Electric Current Electric Current Probably Means
2. Complete the following table about electric current. Electric Current Type of Current
How Charge Flows
Examples
Direct
One direction
Flashlight
Alternating
Two directions
Home or school
3. Electrons flow in the wire from a(n) positive to a(n) terminal.
Conductors and Insulators 4. What is an electrical conductor?
negative
terminal
(page 605)
An electrical conductor is material through which
charge can easily flow.
5. What is an electrical insulator?
An electrical insulator is material through which charge
cannot easily flow.
6. Is the following sentence true or false? Metals are good conductors because they do not have freely moving electrons. false
Physical Science Guided Reading and Study Workbook
■
Chapter 20 181
Name ___________________________ Chapter 20
Class ___________________
Date _____________
Electricity
Match each material to the category of a conductor or insulator. Material Category a b b a b
7. 8. 9. 10. 11.
Copper Plastic Rubber Silver Wood
Resistance
a. conductor b. insulator
(page 605)
12. Explain why the current is reduced as electrons move through a conductor. The electrons collide with electrons and ions. These collisions convert some kinetic energy into thermal energy, leaving less energy to move the electrons.
13. Circle the letter of each factor that affects a material’s resistance. a. its length b. its temperature c. its velocity d. its thickness 14. What is a superconductor? A superconductor is a material that has almost zero resistance when it is cooled to low temperatures.
Voltage
(page 606)
Match each term to its definition. Definition
Term
a. flow of charge 15. A device that converts chemical energy to electrical energy b. voltage a 16. Requires a complete loop c. battery b 17. The difference in electrical potential energy between two places in an electric field 18. Is the following sentence true or false? Three common voltage true sources are batteries, solar cells, and generators.
Ohm’s Law
(page 607)
19. Is the following sentence true or false? According to Ohm’s law, the voltage in a circuit equals the product of the energy and the false resistance. 20. Doubling the voltage in a circuit doubles the current if resistance is held constant. 21. Is the following sentence true or false? Doubling the resistance in a circuit will halve the current if voltage is held constant. true
182
Physical Science Guided Reading and Study Workbook
