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Chassis

Apr 21, 2015
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I think I'm confuse,or the textbook I'm reading is confusing me.

Jus out this question.
The frequency for periodic time of 40us is ......kHz.
F = 1 / 40us

How do you write 40us

a. 0.0000040
b. 0.000040
c. 0.00040

Which one is the proper one.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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The possibly easy way is to think of 40us as 40 x 10^-6 s

so it's

40 x 10^-6 s
4 * 10^-5 s
0.4 * 10^-4 s
0.04 * 10^-3 s
0.004 * 10^-2 s
0.0004 * 10^-1 s
0.00004 * 10^0 s

and because 10^0 = 1

it must be

0.00004 s
 

Martaine2005

May 12, 2015
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Thanks Steve.
That was really helpful for me too.
I copied and printed for my personal help file:)

Martin
 

duke37

Jan 9, 2011
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It could help if you spaced the numbers in groups of three so

40μs = 0.000 040
40ms = 0.040
 

Rowdy

Oct 9, 2015
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I think ya'll got that one covered duke 37, Steve - factual explanation, Analog - right on.
 

Chassis

Apr 21, 2015
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In other words,in my question above

A. Is 4us
B. Is 40us
C. Is 400us

Is that right?
 
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