# 60 Hz

Discussion in 'General Electronics Chat' started by Lightfire, Apr 21, 2011.

1. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
Hello,

After searching at the dictionary, I found out what does Hz means. But I have to clarify it because it might be different.

OK, our circuit breaker is rated as 240 volts 60 Hz.

So means that, if our circuit breaker is rated as 60 Hz, it means it can handle alternating current electric current that reverses 60 times in a second.

Am I correct?

Thanks!

2. ### strantor AAC Fanatic!

Oct 3, 2010
4,302
1,989
correct, as long at the voltage is 240

3. ### DerStrom8 Well-Known Member

Feb 20, 2011
2,428
1,329
Yes, Hz is short for Hertz. Heinrich Hertz is famous for his work with radio waves. Hz means cycles per second (frequency). If you look at a model of an electromagnetic wave, you will see several peaks. One Hz (cycle) would be how many times it goes from peak-to-peak within one second.
I hope this helps!
Der Strom

4. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
What "as long at the voltage 240"?

5. ### DerStrom8 Well-Known Member

Feb 20, 2011
2,428
1,329
"As long AS the voltage IS 240". If the frequency is still 60 Hz, but at 440 volts, you'll still be in trouble

6. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
Why would I be in trouble?

7. ### russ_hensel Distinguished Member

Jan 11, 2009
820
47
it reverses 120 times a second. a full wave is 2 reversals.

8. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
I thought 60 times a second?

9. ### mbohuntr Active Member

Apr 6, 2009
413
32
AC voltage "alternates" positive to negative and back to the beginning making one cycle. The frequency is how many cycles per second it rotates. The Voltage or "Amplitide" is the measurement of the height of the wave above zero. (peak voltage) If you measure it from the highest point above zero, to the lowest point below zero, it's called
"peak to peak" . AC Voltage can be created at any frequency, but the standard is 60 hz for US and others, and 50 hz in parts of Europe and Japan. See this..

Apr 6, 2009
413
32
11. ### magnet18 Senior Member

Dec 22, 2010
1,232
125
I thought 2 phase form the power companies was 180° out of phase?

To answer lightfires question, one hertz is one cycle per second. one cycle is going back AND forth.
If you have a 60Hz voltage source, it cycles 60 times a second, which is the same as going back and forth 120 times a second.

12. ### mbohuntr Active Member

Apr 6, 2009
413
32
Actually, what you are seeing is the magnetic field which is out of phase with the actual voltage it creates. Commercial generation is three phase(Three individual sets of poles) 120 degrees apart. Check out the three phase simulation a couple of pages down.

13. ### DerStrom8 Well-Known Member

Feb 20, 2011
2,428
1,329
Yes, I apologize. I should not have worded it that way. I meant from, for example, the top of one peak to the top of the next one (above zero). As Russ said, one full wave is two reversals of current.
Der Strom

14. ### magnet18 Senior Member

Dec 22, 2010
1,232
125
Right, makes sense, thanks

Yea, I knew about three phase...
Wait, isn't the power coming from the wall actually one phase, not two...
*facepalm
Never-mind then.

15. ### mbohuntr Active Member

Apr 6, 2009
413
32
*facepalm
Never-mind then.
[/QUOTE]

Welcome to MY world...I do it frequently...