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in an Ac maximum value of voltage is 423 what

is effective voltage

Since power is proportional to the square of the voltage the effective voltage, known as the RMS voltage (the root, mean, square voltage) is determined by squaring the AC voltage, taking the average (the mean) and then take the square root:

Vrms=sqrt(Vac^2/2)=Vac/sqrt(2)=423/sqrt(2)=299V

What RMS voltage means in this case is that an AC voltage of 423 Volts can do the same amount of work as can a DC voltage of 299 Volts! It is the DC voltage equivalent of a given AC voltage.

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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.