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Name _________________________________________________________________________ Date _________________________
Instructor _____________________________________________________________________ Score ________________________
Chapter
17
h
a
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te
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hapter
Objective: After studying this chapter, you will be able to describe the parts of the atom and explain the
principles of electricity.
Atomic Structure
For questions 1–5, match the following terms and identifying phrases.
Electrical Principles
(A) Matter
(B) Atom
(C) Element
(D) Molecule
(E) Compound
________ 1. A substance composed of molecules containing two or more
elements.
________ 2. A group of one type of atom.
________ 3. A microscopic particle that cannot be broken into smaller pieces
without losing its properties.
________ 4. Anything in the universe that occupies space and has mass (weight).
________ 5. A group of two or more atoms joined together.
6. The three parts of an atom are _____, _____, and _____. _________________________________________________
_________________________________________________
_________________________________________________
Electricity
7. Movement of free electrons is the result of _____ and _________________________________________________
_____ charges between atoms.
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8. Defi ne electricity.
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9. If a wire has a negative charge on one end and a _________________________________________________
positive charge on the other end, _____ will result.
10. A(n) _____ is a substance that allows the fl ow of free _________________________________________________
electrons.
11. A (n) _____ is a substance that resists the fl ow of free _________________________________________________
electrons.
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
98 Modern Automotive Technology Workbook
12. Name three basic functions of electricity.
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13. Electrical devices can do the job of mechanical devices _________________________________________________
(more, less) _____ quickly and effi ciently.
14. When a component uses less than one or two volts for _________________________________________________
operation, it is _____.
15. A(n) _____ is a conventional component that uses _________________________________________________
electricity to do work.
Magnetism
16. Magnetism is an atomic _____ that can attract or repel _________________________________________________
ferrous (iron-containing) substances through space, air,
or solid matter.
17. Like charges _____ each other. _________________________________________________
18. Unlike charges _____ each other. _________________________________________________
19. Defi ne electromagnetism.
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20. What is the process of creating electricity in a wire by passing the wire through a magnetic fi eld?
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Electric Circuits
21. Identify the parts of the simple circuit illustrated below.
B
C
A
(A) _____________________________________________
(B) _____________________________________________
(C) _____________________________________________
22. Describe and explain the three fundamental properties of electrical circuits.
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Chapter 17 Electrical Principles 99
Name _________________________________________________________________________
Conventional and Electron Theories
23. According to conventional current theory, electrons _________________________________________________
ow from (positive, negative) _____ to
_________________________________________________
(positive, negative) _____.
24. According to electron fl ow theory, electrons fl ow from _________________________________________________
(positive, negative) _____ to (positive, negative) _____.
_________________________________________________
Direct and Alternating Current
25. Defi ne direct current (dc) and alternating current (ac).
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26. _____ is the number of cycles per second, or _____. _________________________________________________
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