Using a DVOM, What m, k, and M mean
AT 121 - Chapter 6 Lab 2 - Using a DVOM, What m, k, and M mean.
Name: ______________________________________
Date: _______________________________________
The metric system, a means of standardization, is based on the number 10. Numbers with 12 or more zeros in them can be cumbersome, and both space- and time consuming. Therefore, a system of prefixes makes calculations easier. These prefixes, together with their associated symbols and values are:
TERM SYMBOL VALUE
milli m 1/1,000 (0.001)
kilo K 1,000
mega M 1,000,000
Notice that prefixes for numbers greater than one are symbolized by capital letters, but symbols for prefixes of less than one are lower case letters. As shown in the chart above: to convert any value to mega, move the decimal point six places to the right; to convert any value to kilo, move the decimal point three places to the right; to convert any value to milli, move the decimal point three places to the left.
The following list provides some examples of how prefixes would be used in conjunction with common circuit variables. The abbreviation provided with each example is the way that value would actually be written on schematics or other technical information.
1mV = .001V
1mA = .001A
50mV = .050V
500mV = .5V
1,450 mV = 1.450V
1K Ω = 1000 Ω (Funny how a car that sells for 1K = $1000!)
1.2K Ω = 1,200 Ω
.345K Ω = 345 Ω
1MΩ = 1,000,000 Ω
1.2MΩ = 1,200,000 Ω
7M = 7,000,000 Ω
.234MΩ = 234,000 Ω
Convert the values to electrical units;
1. .788 A equals how many milliamperes? ___788mA_____
2. 0.0788 A equals how many milliamperes? ____78.8mA_________
3. 50 mA equals how many amperes? ______.050A_________
4. 110 mA equals how many amperes? _____.110A____________
5. 7 A equals how many mA? ______7,000mA_________________
6. 30 mA equals how many A?____.030A____
7. .55 mA equals how many amperes?___.00055A_______
8. 235,000,000 milliamperes equals many A? ____235,000A_____
9. 12 V equals how many mV? ____12,000mV_________________
10. 243 mV equals how many volts? _____0.243V____________
11. 10 V equals how many millivolts? ______10,000mV________
12. 3V equals how many kV? _____.003kV__________________
13. 3mV equal how many volts?____.003V_______________
14. 300 milivolts equal how many kilovolts? ______.0003kV______
15. 32 k Ω equals how many Ω? ____32,000ohms_____________
16. 32M Ω equals how many ohms? ____32,000,000ohms________
17. 3500 ohms equals how many kΩ? ____3.5kOhms_____________
18. 3.5 k Ω equals how many Ω? ____3500Ohms______________
19. 2200 Ω equal how many kΩ? ___2.2KOhms___________________
20. 1,000 Ω plus 10 kilohms equal how many Ω? ___11,000 Ohms_____
21. 2,000 Ωminus 100 miliohms equal how many Ω? _1,999.9 Ohms___
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(Parts of this document take from: Electrical/Electronic Systems Specialist Developing Basic Diagnosis and Repair Skills Unit 3 Student Workbook 2/09/05)
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