micro seconds

Discussion in 'General Electronics Discussion' started by Chassis, Oct 10, 2015.

1. Chassis

34
2
Apr 21, 2015
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.

2,502
719
Jun 10, 2015
b.

ak

3. Chassis

34
2
Apr 21, 2015
Thank you analog.

4. (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,497
2,838
Jan 21, 2010
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 likes this.
5. Martaine2005

3,507
951
May 12, 2015
Thanks Steve.
That was really helpful for me too.
I copied and printed for my personal help file

Martin

6. duke37

5,364
772
Jan 9, 2011
It could help if you spaced the numbers in groups of three so

40μs = 0.000 040
40ms = 0.040

Martaine2005 likes this.
7. Rowdy

16
1
Oct 9, 2015
I think ya'll got that one covered duke 37, Steve - factual explanation, Analog - right on.

8. Chassis

34
2
Apr 21, 2015
Thank you all.

9. Chassis

34
2
Apr 21, 2015
In other words,in my question above

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

Is that right?

10. Chassis

34
2
Apr 21, 2015
Duke37 briliant technique.