Alternating Current Formulas
- Conversion of different values of AC
- RMS = PEAK x 0.707
- PEAK = RMS x 1.414
- AVE. = PEAK x 0.637
Find the following
RMS = 120 V………..169.8V PEAK
PEAK= 339.36………240V effective (RMS)
RMS = 120V…………339.6V PEAK to PEAK
AVG. = 187.28V……..294V PEAK
Frequency Formula
F = NP / 120
F = Frequency in Hz
N = speed in RPM
P = # of poles in the alternator
120 = # of alternations per cycle x seconds in a minute (2 x 60)
Answer the following:
At what speed must four pole generator rotate to develop a frequency of 50 Hz?
F = NP/120
50 = Nx4/120
N= 50 x 120/ 4
N= 1500 RPM
Examples:
In Phase…….When the voltage wave and current wave reach values, and 0 values at the same point in time
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