1.What is a rmf value of A.C.?Why do we need it?

Asked by Prakash | 17th Nov, 2017, 11:34: PM

Expert Answer:

- RMS value of an AC current represent the equal amount of power in DC current.
- If there are two circuits, D.C and A.C and both are required to be of the same amount of power (or energy per second) then we would choose the D.C values of current and voltage to be the same as the rms values of current and voltage in the a.c. circuit.
- The below are the voltage and current rms values.
 
 begin mathsize 12px style straight V subscript rms equals fraction numerator straight V subscript straight o over denominator square root of 2 end fraction end style
begin mathsize 12px style straight I subscript rms equals fraction numerator straight I subscript straight o over denominator square root of 2 end fraction end style
- Here Vo and Io are the peak values of voltage and current respectively.

Answered by Abhijeet Mishra | 20th Nov, 2017, 04:00: PM