# meaning of ELF, VF, ...

Discussion in 'Electronic Basics' started by [email protected], Apr 27, 2007.

1. ### Guest

What is the meaning of ELF, VF, VLF, LF, MF, HF, UHF, SHF, EMF in
electromagnetic spectrum?
I want to know the long term of them. thanks.

2. ### EeyoreGuest

VF ?

F = frequency.
L = low
M = medium
H = high
V = very
U = ultra
S = super

Electromotive force = voltage.

You could have used Google actually or Wikipedia.

http://en.wikipedia.org/wiki/Electromagnetic_spectrum

Graham

3. ### EeyoreGuest

Wikipedia says Voice Frequency but I've never heard anyone use that one.

More usual is AF = audio frequency as opposed to RF = radio frequency.

Graham

4. ### Stephen J. RushGuest

I started to write a list of definitions, but it's easier to just
point to Wikipedia:

http://en.wikipedia.org/wiki/Electromagnetic_spectrum

"EMF" refers to the electromagnetic field, any frequency.

5. ### Michael BlackGuest

The "F" in all of them mean "Frequency". The other letters denote the
segment of the spectrum, and it's not a code. Each are the first letters
of a real word, that describes where in the spectrum the segment is.

The caveat is that I've never heard of "VF", you're missing "VHF" (after
"HF") and unless there's a new meaning "EMF" is "electromagnetic force"
and doesn't belong with the others.

Since you have the right ordering, then figure it out yourself.
If at one end the frequencies are lowest, and the other end the frequencies
are highest, then what in the world might "ELF" mean?

Make an obvious guess, and that may be the key to the rest.

Michael

6. ### EeyoreGuest

Electromotive force.

Graham

7. ### EeyoreGuest

I missed E = extremely !

Graham

8. ### Rich GriseGuest

No, it's electromotive Force == voltage.

Cheers!
Rich

9. ### Stephen J. RushGuest

Of course it is. Sometimes the old cerebral S/N ratio falls off around 4
AM, especially when I'm running short of caffeine.

10. ### Michael A. TerrellGuest

That is a mortal SIN! You must maintain proper caffeine levels at
all times! ;-)

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida