Quote Originally Posted by ronsimpson View Post
Savnik,

You need to get a book on basic electronics. Voltage Current Power and Resistance.
Power = voltage * current
In your case you can not see the current so: Power = Voltage * Voltage /Resistance (Voltage squared)
To prove that look at your table. Voltage of 22.4 volts = 10 watts and Voltage of 44.7 volts = 40 watts. Voltage increases 2:1 and power increases 4:1. That proves there is a voltage squared * constant.

Voltage * Voltage/50 = Power

To convert to db is very hard or very simple depending on how you look at it. You can fight BIG math for weeks. When you understand db it is almost as simple as finding Power. I will not tell you how now. You need to think about it for a while.

RonS.
I am a electronic for 30 years.
Thank you for your help. You give me some idea how to calculate.