Here's a bit more techinal version of the answer...
LOL if that makes sence to you then you can ingore the rest of my answer! LOL
RMS is only used with Alternating Current or AC not Direct Current or DC. It's basicly an average.
In the United States our electricity is 120 volts at 60 hertz. What that means is that our electricty changes for positive to negitive 60 times a second. But it goes way past 120 volts, both positive and negitive are somewhere closer to 150 volts I believe. The RMS or \"average\" is 120 volts.
If you look at the graph the line that cuts across the two red humps represents RMS. The red humps represent Voltage.
Since this is a guitar effects processor forum, you probably want to know why some speaker systems/power amps/[insert amplification device here] list their power rating in RMS.
RMS Watts is a more fair rating as it rates the average power something produces (or can receive if it's a speaker).
Many times, shady manufactures advertise their power rating as Peak power, which in practice doesn't mean much, since that peak could have lasted less than a microsecond and the device can't sustain peak power for more than that.
So if you see the RMS power rating, you can be pretty sure that it can output that kind of power for pro-longed periods of time.
As anything, RMS power is only one of the many things to look at.
Hi Koori, I saw your question about what is RMS. There were several answers posted on the forum, but I want to answer you this way.
RMS, is Root Mean Squared, it is a way to calculate the average magnitude of a series of numbers. Take the series 3, 4,5,6 for example.
We add the squares
3 squared + 4 squared +5 squared + 6 squared
or
9+16+25+36=86
Now we find the average 86 divide by 4 (because there were 4 numbers)
= 21.5
Now find the square root of 21.5 which is about 4.52
That is a very basic example of calculating RMS.
So now in the audio world the engineers look at the sine wave as amplitude versus time. They can break down a sine wave at any time and record the instantaneous value for the whole 360 degrees of the wave form. The more data points taken the better the picture. However they can still apply the method to the data points.
As long as the load is purely resistive things work fairly well, because current and voltage are in phase. So if we know the value of resistance and the value of the instantaneous voltage, then we can determine the instantaneous current with I=E\\R, (voltage divided by resistance),then we can calculate power with P=IxE. (current times power).
So RMS power is the calculation of the instantaneous power along the sine wave and then applying the original formula of squaring the values, finding the average and the square root
Hope that helps.
It's much complicated when the circuit is not purely resistive, and I will not go into that here.
Comments
LOL if that makes sence to you then you can ingore the rest of my answer! LOL
RMS is only used with Alternating Current or AC not Direct Current or DC. It's basicly an average.
In the United States our electricity is 120 volts at 60 hertz. What that means is that our electricty changes for positive to negitive 60 times a second. But it goes way past 120 volts, both positive and negitive are somewhere closer to 150 volts I believe. The RMS or \"average\" is 120 volts.
If you look at the graph the line that cuts across the two red humps represents RMS. The red humps represent Voltage.
KT
Is that too vague?
Since this is a guitar effects processor forum, you probably want to know why some speaker systems/power amps/[insert amplification device here] list their power rating in RMS.
RMS Watts is a more fair rating as it rates the average power something produces (or can receive if it's a speaker).
Many times, shady manufactures advertise their power rating as Peak power, which in practice doesn't mean much, since that peak could have lasted less than a microsecond and the device can't sustain peak power for more than that.
So if you see the RMS power rating, you can be pretty sure that it can output that kind of power for pro-longed periods of time.
As anything, RMS power is only one of the many things to look at.
RMS, is Root Mean Squared, it is a way to calculate the average magnitude of a series of numbers. Take the series 3, 4,5,6 for example.
We add the squares
3 squared + 4 squared +5 squared + 6 squared
or
9+16+25+36=86
Now we find the average 86 divide by 4 (because there were 4 numbers)
= 21.5
Now find the square root of 21.5 which is about 4.52
That is a very basic example of calculating RMS.
So now in the audio world the engineers look at the sine wave as amplitude versus time. They can break down a sine wave at any time and record the instantaneous value for the whole 360 degrees of the wave form. The more data points taken the better the picture. However they can still apply the method to the data points.
As long as the load is purely resistive things work fairly well, because current and voltage are in phase. So if we know the value of resistance and the value of the instantaneous voltage, then we can determine the instantaneous current with I=E\\R, (voltage divided by resistance),then we can calculate power with P=IxE. (current times power).
So RMS power is the calculation of the instantaneous power along the sine wave and then applying the original formula of squaring the values, finding the average and the square root
Hope that helps.
It's much complicated when the circuit is not purely resistive, and I will not go into that here.
Take care Koori...
When you gonna post some more stuff????
See Ya,
Tal