# V or I written with ^ or -

Discussion in 'Homework Help' started by norstudent, Mar 6, 2014.

1. ### norstudent Thread Starter New Member

Feb 26, 2014
26
0
Hi

What do the ^ on top of V/E or I mean and what does the straight line above them mean?

For example Î and.. (I cant type the others, you probably know what I mean)

2. ### Papabravo Expert

Feb 24, 2006
11,131
2,173
The circumflex (^) can mean that the quantity is a vector.
The horizontal bar above a capital letter can mean either the logical complement as in "NOT V" or it can also mean the average or mean value. Can you give us some context?

Nov 9, 2007
5,005
519
4. ### norstudent Thread Starter New Member

Feb 26, 2014
26
0
Sorry.. The context is power calculations in AC circuits!

Nov 9, 2007
5,005
519
6. ### WBahn Moderator

Mar 31, 2012
20,226
5,750
The ^ is also often used for the "expectation value", so if you had a problem that was dealing with a measured or actual value in comparison to a calculated value, you might see it used that way.

But I agree with the others that it is probably indicating that it is a phasor, possibly a unit vector.

It would help if you could scan a bit of text or a diagram that uses them both so that we have some good context to consider.

7. ### daviddeakin Active Member

Aug 6, 2009
207
27
My old professor used to use the ^ to mean the peak value, and the straight line to mean the average (mean) or DC value.

8. ### LvW Active Member

Jun 13, 2013
674
100
Not only "old" professors.
Yes - for my opinion and according to my knowledge (and education in Germany) this sign indicates PEAK values.

9. ### BytetoEat New Member

Mar 5, 2014
25
5
It's for phasors..

10. ### vk6zgo Active Member

Jul 21, 2012
677
85
I've only seen it for peak values in Australia,too.