micro seconds

[Chassis]

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.

 

[AnalogKid]

b.

ak

 

[Chassis]

Thank you analog.

 

[(*steve*)]

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]

Thanks Steve.
That was really helpful for me too.
I copied and printed for my personal help file

Martin

 

[duke37]

It could help if you spaced the numbers in groups of three so

40μs = 0.000 040
40ms = 0.040

 

[Rowdy]

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

 

[Chassis]

Thank you all.

 

[Chassis]

In other words,in my question above

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

Is that right?

 

[Chassis]

Duke37 briliant technique.