 |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
| • HOME • ABOUT • CATEGORIES • USE OF TEXT AND IMAGES • NEWSLETTER   
|
neper (Np)
Named for the mathematician James Napier, a unit used to express the ratio of quantities such as current or voltage. Thus the ratio N, in nepers, of current I1 and I2 is N = ln(I2/I1). The neper is thus the natural logarithmic equivalent (see logarithm) of the decibel. Power ratios, say of powers P1 and P2, can also be expressed in nepers; here N = ½ ln (P2/P1), and 1 neper = 8.686 dB.
Related category
• UNITSAlso on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History