You are here:

Physics/Electricity Help

Advertisement


Question
If A standard electrical outlet provides a 120-Hz sinewave. Would the average voltage be 108.08616?if the peak to peak voltage is 339.36

Answer
The "average" voltage, called the RMS [root-mean-square] voltage is the DC equivalent voltage that can do the same amount of work as a particular AC voltage and is calculated from:
Vrms=Vpeak/sqrt2=339.36/sqrt2=239.96 Volts
To get this value you square the peak voltage, divide by 2 to get the average and then take the square root to get the RMS DC equivalent voltage.

Physics

All Answers


Answers by Expert:


Ask Experts

Volunteer


James J. Kovalcin

Expertise

I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

©2016 About.com. All rights reserved.