Chapter 1 Introduction to a Typical PC 31
• ESD is a static charge of electricity that can damage integrated circuits; EMI is
interference or damage to components caused by magnets and magnetic fields;
and RFI is interference produced by electronic devices that use radio waves.
• Typical tools used in computer repair are flat tip screwdriver, Phillips
screwdriver, star drivers, compressed air, anti-static wrist strap, multimeter,
extraction tool, and extra screws.
• Some common safety practices related to computer repair are to disconnect
electrical power from the computer before beginning repair and to avoid
touching electronic components while the computer is energized or soon
after the computer has been turned off.
Review
Answer the following questions on a separate sheet of paper. Please do not write in this book.
1. Give three examples of how computers are used in industry.
2. Describe the difference between a digital and an analog electronic device.
3. Which of the following items acts like an analog system, and which is most
like a digital system?
a. automobile gas pedal
b. streetlight
c. drawbridge
d. car horn
e. wind speed
f. slide trombone
g. drum
h. flashlight
4. Data can be _____.
a. text
b. sound
c. pictures
d. All the answers are correct.
5. The binary number system consists of the decimal numbers _____ and _____.
6. List the characters for the hexadecimal number system from zero to fifteen.
0 = _____ 1 = _____ 2 = _____ 3 = _____ 4 = _____ 5 = _____ 6 = _____
7 = _____ 8 = _____ 9 = _____ 10 = _____ 11 = _____ 12 = _____
13 = _____ 14 = _____ 15 = _____
7. Complete the following statement about the basic computer units of data.
There are eight _____ in one _____.
8. What letter symbol represents bit?
9. What letter symbol represents byte?
10. How many bytes are in a 32-bit word?
11. Describe the difference between serial data transfer and parallel data
transfer.
Review QQuestionssuestion