k,M,G,T,P,E // m,μ,n,p,f,a

J=I/S
R.S= .L
G=1/R
T=To+Rt-Ro/ .Ro
Rt=Ro.[1+ .(T-To)]
Rt/Ro=1+ .(T-To)
I=U/R; R=U/I; U=I.R
U=U1-U2; U=U/U1.100%
W=Q.U; W=I.t.U;Q=I.t;
P=U.I; P=W/t; P=R.I2; P=U2/R
N=P2/P1; 100%Q=R. I2.t