Calculating RMS Value for Unequal Peak Amplitudes

AI Thread Summary
To calculate the RMS value for a wave with unequal peak amplitudes, the standard formula of peak positive amplitude divided by root 2 does not apply directly. Instead, it is suggested to average the amplitudes, effectively shifting the reference point to equalize positive and negative amplitudes. The RMS voltage can be calculated using the formula √(V1² + V0²/2), where V1 represents the constant offset voltage and V0 is the sinusoidal amplitude. The discussion highlights the importance of understanding the relationship between the amplitudes to achieve an accurate RMS calculation. Clarifications and detailed calculations can be provided upon request.
lavster
Messages
213
Reaction score
0
If I have a wave that looks pretty much sinusoidal but the peak positive amplitide is greater than the peak negative applitude how do I calcualte the rms vlaue - is it still the peak positive amplitude divided by root 2?
Thanks :)
 
Physics news on Phys.org
I would take an average of the amplitudes. but how large is the difference? If you take an average it would be equal to move the refrence point to where the amplitudes is equal for both the negative and the positive. and then it is a perfect sinusoid.
 
Interesting question!

Unless I've miscalculated, the rms voltage is given by \sqrt{V_1^2 + \frac{V_0^2}{2}} in which V1 is the constant offset voltage and V0 is the amplitude of the sinusoidal voltage.

Calculations can be revealed if requested!
 
Last edited:
Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

I am reading the Griffith, Electrodynamics book, 4th edition, Example 4.8. I want to understand some issues more correctly. It's a little bit difficult to understand now. > Example 4.8. Suppose the entire region below the plane ##z=0## in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility ##\chi_e##. Calculate the force on a point charge ##q## situated a distance ##d## above the origin. In the page 196, in the first paragraph, the author argues as follows ...
View full post »
Thread 'Inducing EMF Through a Coil: Understanding Flux'

Thread 'Inducing EMF Through a Coil: Understanding Flux'

Thank you for reading my post. I can understand why a change in magnetic flux through a conducting surface would induce an emf, but how does this work when inducing an emf through a coil? How does the flux through the empty space between the wires have an effect on the electrons in the wire itself? In the image below is a coil with a magnetic field going through the space between the wires but not necessarily through the wires themselves. Thank you.
View full post »

Similar threads

Energy within an electric field
Replies
40
Views
4K
Engineering Power and RMS Value of a Signal
Replies
4
Views
8K
Root-mean squared values and a.c. emf
Replies
5
Views
3K
I Summing and averaging RMS pressure (amplitude) of sound waves
Replies
2
Views
2K
B Probability of seeing peak noise in a given time window
Replies
3
Views
2K
What Should Manufacturers Specify: Peak Power or Average Power in Audio Systems?
Replies
1
Views
2K
What is the relationship between voltage, electric potential, and power?
Replies
1
Views
2K
How to Determine Various Waveform Parameters from a Graph?
Replies
3
Views
3K
RMS value secondary voltage electronic halogen transformer
Replies
1
Views
2K
What Are the Average and RMS Values of Waveforms?
Replies
4
Views
8K

Hot Threads

Recent Insights

Back
Top