Chapter 11 - SJTU 1 Chapter 11 AC power analysis SJTU 2 rms...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: SJTU 1 Chapter 11 AC power analysis SJTU 2 rms value The rms value of a periodic function is defined as the square root of the mean value of the squared function. effective value or DC-equivalent value The RMS value is the effective value of a varying voltage or current. It is the equivalent steady DC (constant) value which gives the same effect. ∫ = T rms dt t v T V 2 ) ( 1 SJTU 3 If the periodic function is a sinusoid, then What do AC meters show, is it the RMS or peak voltage? AC voltmeters and ammeters show the RMS value of the voltage or current. What does '6V AC' really mean, is it the RMS or peak voltage? If the peak value is meant it should be clearly stated, otherwise assume it is the RMS value . m m T m rms V V t V T V 707 . 2 1 ) ( cos 1 2 2 = = + = ∫ φ ϖ SJTU 4 AC power analysis Instantaneous Power v(t) i(t) N ) cos( 2 ) ( cos 2 ) ( φ ϖ ϖ- = = t I t i t V t v rms rms Suppose: ) 2 cos( cos ) cos( 2 cos 2 φ ϖ φ φ ϖ ϖ- + =- × = = t I V I V t I t V vi p rms rms rms rms rms rms Invariable part Sinusoidal part SJTU 5 E page415 figure 10.2 SJTU...
View Full Document

{[ snackBarMessage ]}

Page1 / 22

Chapter 11 - SJTU 1 Chapter 11 AC power analysis SJTU 2 rms...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online