Form Factor and Peak Factor For B.Tech Students Presented by: P ROSHAN College Name
Introduction Alternating Current (AC) changes magnitude and direction with time. We use RMS, Average, and Peak values to analyze AC. Two important ratios: Form Factor and Peak Factor.
What is Form Factor? Form Factor = Ratio of RMS value to Average value of an AC waveform. Formula: Form Factor = Irms / Iavg Indicates waveform shape compared to DC.
Form Factor for Sine Wave Irms = 0.707 × Im Iavg = 0.637 × Im Form Factor = 0.707 / 0.637 = 1.11
Significance of Form Factor Helps identify waveform distortion. Used in designing AC measuring instruments. Different waveforms have different form factors (e.g., square, triangular).
What is Peak (Crest) Factor? Peak Factor = Ratio of maximum value to RMS value. Formula: Peak Factor = Imax / Irms Indicates how high the waveform peaks.
Peak Factor for Sine Wave Irms = 0.707 × Im Peak Factor = Im / 0.707 Im = 1.414
Significance of Peak Factor Helps determine insulation levels for electrical equipment. Important in waveform analysis and safety.
Comparison Table Parameter Formula Sine Wave Value Meaning Form Factor Irms / Iavg 1.11 Shape of waveform Peak Factor Imax / Irms 1.414 Height of peak