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Science

Equation
         
    Name Neper  
 
    Equation n = ln ( I 1 I 2 ) = ln ( P 1 P 2 )  
 
    Definition of terms

n = number of nepers, I1 and I2 = currents, voltages or analogous quantities, P1 and P2 = powers

 
 
    Comments

  The neper is used for the expression of the ratio of two currents, voltages or analogous quantities. In this case, the number of nepers is equal to the logarithm of the ratio. It can also be used as an expression of the ratio of two powers, when it is equal to the logarithm of the square root of the ratio.

The decineper, equal to one-tenth of a neper, is often used.

  
 
    References McGraw-Hill Dictionary of Physics and Mathematics , McGraw-Hill, 1978  
         


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