## neper (Np)The neper (Np), named for the mathematician James Napier, is a unit used to express the ratio of quantities such as current or voltage. Thus the ratio N, in
nepers, of current I_{1} and I_{2} is
N = ln(I_{2}/I_{1}). The neper is thus
the natural logarithmic equivalent (see logarithm)
of the decibel. Power ratios, say of powers
P_{1} and P_{2}, can also be expressed
in nepers; here N = ½ ln (P_{2}/P_{1}),
and 1 neper = 8.686 dB. ## Related category• UNITS | |||||

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